And when he had considered ... - Thinking on the subject; considering what he should do in these circumstances.

He came to the house of Mary ... - Probably this house was near him; and he would naturally seek the dwelling of a Christian friend.

The mother of John ... - Probably this was the John Mark who wrote the gospel. But this is not certain.

Whose surname - Greek: who was called Mark. It does not mean that he had two names conferred, as with us, both of which were used at the same time, but he was called by either, the Greeks probably using the name Mark, and the Jews the name John. He is frequently mentioned afterward as having been the attendant of Paul and Barnabas in their travels, Acts 12:25; Acts 15:39; 2 Timothy 4:11. He was a nephew of Barnabas, Colossians 4:10.

Where many were gathered together, praying - This was in the night, and it shows the propriety of observing extraordinary seasons of prayer, even in the night. Peter was to have been put to death the next day; and they assembled to pray for his release, and did not intermit their prayers. When dangers increase around us and our friends, we should become more fervent in prayer. While life remains we may pray; and even when there is no human hope, and we have no power to heal or deliver, still God may interpose, as he did here, in answer to prayer.

And when he had considered - When he had weighed every thing, and was fully satisfied of the Divine interposition, he went to the house of Mary, the mother of John Mark, the author of the Gospel, where it appears many were gathered together making prayer and supplication, and probably for Peter's release.

And when he had considered the thing,.... The whole of the salvation wrought for him; or rather, where he should go, to what house he should betake himself; ere he was aware,

he came to the house of Mary the mother of John, whose surname was Mark. This good woman seems to be a widow, no mention being made of her husband, and was sister to Barnabas, Colossians 4:10. She is described by a son she had, whose name was John Mark, because of the frequent mention made of him hereafter; her house being large, and her heart as large as her house, the saints met here, and were welcome, and where they were at this time, though so late:

where many were gathered together, praying; the Ethiopic version adds, "for him"; and there were some in other places, for one place could not hold them all; see Acts 12:17 they held out to the end in prayer; this was their last effort in this way, and in this they were no doubt exceeding vehement and importunate, and they succeeded; so true is that observation in James 5:16.

When he had considered (συνιδών)

The verb strictly means to see together, or at the same time. Hence, to see in one view, to take in at a glance. Peter's mental condition is described by two expressions: First, he came to himself (Acts 12:12), or, lit., when he had become present in himself; denoting his awaking from the dazed condition produced by his being suddenly roused from sleep and confronted with a supernatural appearance (see Acts 12:9). Secondly, when he had become aware (συνιδών); denoting his taking in the situation, according to the popular phrase. I do not think that any of the commentators have sufficiently emphasized the force of σύν, together, as indicating his comprehensive perception of all the elements of the case. They all refer the word to his recognition of his deliverance from prison, which, however, has already been noted in Acts 12:11. While it may include this, it refers also to all the circumstances of the case present at that moment. He had been freed; he was there in the street alone; he must go somewhere; there was the house of Mary, where he was sure to find friends. Having taken in all this, perceived it all, he went to the house of Mary.

{5} And when he had considered the thing, he came to the house of Mary the mother of John, whose surname was Mark; where many were gathered together praying.

(5) Holy meetings in the nights of both men and women (when they cannot take place in the day time) are allowable by the example of the apostles.

12:12 Came to the house of Mary. This Mary was the mother of Mark, called in Acts both John and Mark. See Ac 13:5,13 15:39 She was related to Barnabas (Col 4:10).

Many were assembled together praying. For Peter's deliverance.

12:12 And having considered - What was best to be done. Many were gathered together - At midnight.

12-17. he came to the house of Mary, &c.-who "must have had a house of some pretensions to receive a large number; and, accordingly, we read that her brother Barnabas (Col 4:10) was a person of substance (Ac 4:37). She must also have been distinguished for faith and courage to allow such a meeting in the face of persecution" [Webster and Wilkinson]. To such a house it was natural that Peter should come.

mother of John . Mark-so called to distinguish him from the apostle of that name, and to distinguish her from the other Marys.

where many were gathered together praying-doubtless for Peter's deliverance, and continuing, no doubt, on this the last of the days of unleavened bread, which was their last hope, all night in prayer to God.

12:12-19 God's providence leaves room for the use of our prudence, though he has undertaken to perform and perfect what he has begun. These Christians continued in prayer for Peter, for they were truly in earnest. Thus men ought always to pray, and not to faint. As long as we are kept waiting for a mercy, we must continue praying for it. But sometimes that which we most earnestly wish for, we are most backward to believe. The Christian law of self-denial and of suffering for Christ, has not done away the natural law of caring for our own safety by lawful means. In times of public danger, all believers have God for their hiding-place; which is so secret, that the world cannot find them. Also, the instruments of persecution are themselves exposed to danger; the wrath of God hangs over all that engage in this hateful work. And the range of persecutors often vents itself on all in its way.