These six brethren - Probably pointing to them, being present, as proper persons to confirm the truth of what he was delivering.

And the Spirit bade me go with them, nothing doubting,.... See Gill on Acts 10:20,

moreover, these six brethren accompanied me; it seems by this, that the six brethren that went along with Peter from Joppa to Caesarea, came also with him from thence to Jerusalem, and were now present, whom he points to; so that it looks as if Peter was aware, that he should be called to an account for his conduct, when he should come to Jerusalem; and therefore brought these six brethren with him, to be witnesses for him, of what they had seen and heard, which was a very wise and prudential step:

and we entered into the man's house; the house of Cornelius, for entering into whose house they were contending with him, and where he entered not alone, but the six brethren with him; the Ethiopic version wrongly reads "three".

Nothing doubting (μηδὲν διακρινόμενον)

The Rev. renders making no distinction, taking the verb in its original sense, which is to separate or distinguish. The rendering seems rather strained, doubting being a common rendering in the New Testament and giving a perfectly good sense here. See Matthew 21:21; Mark 11:23, and note on James 1:6. It was natural that Peter should hesitate.

The six brethren

The men of Joppa who had gone with Peter to Cornelius, and had accompanied him also to Jerusalem, either as witnesses for him or for their own vindication, since they had committed the same offence.

And the Spirit bade me go with them, nothing doubting. Moreover these six brethren accompanied me, and we entered into the man's house:

11:12 These six brethren accompanied me. These were brethren of Joppa, but Peter had taken them to Jerusalem to confirm his words. He knew his course would be called into question.

12-18. we entered the man's house-No mention of Cornelius' name, much less of his high position, as if that affected the question. To the charge, "Thou wentest in to men uncircumcised," he simply speaks of the uncircumcised "man" to whom he had been divinely sent.

11:1-18 The imperfect state of human nature strongly appears, when godly persons are displeased even to hear that the word of God has been received, because their own system has not been attended to. And we are too apt to despair of doing good to those who yet, when tried, prove very teachable. It is the bane and damage of the church, to shut out those from it, and from the benefit of the means of grace, who are not in every thing as we are. Peter stated the whole affair. We should at all times bear with the infirmities of our brethren; and instead of taking offence, or answering with warmth, we should explain our motives, and show the nature of our proceedings. That preaching is certainly right, with which the Holy Ghost is given. While men are very zealous for their own regulations, they should take care that they do not withstand God; and those who love the Lord will glorify him, when made sure that he has given repentance to life to any fellow-sinners. Repentance is God's gift; not only his free grace accepts it, but his mighty grace works it in us, grace takes away the heart of stone, and gives us a heart of flesh. The sacrifice of God is a broken spirit.