Strangers ... - i. e. "Israelites of the tribes of Ephraim and Manasseh." The separation of the two kingdoms had made their Israelite brethren "strangers," or "foreigners," to Judah.

And the strangers - Many out of the different tribes, particularly out of Simeon, Ephraim, and Manasseh, having reflected that the Divine blessing was promised to the house of David, and finding the government of Jeroboam founded in idolatry, would naturally, through a spirit of piety, leave their own country, and go where they might enjoy the worship of the true God.

And he gathered all Judah and Benjamin, and the strangers with them,.... The proselytes of the gate:

out of Ephraim and Manasseh, and out of Simeon: out of all the places in those tribes that had come off to him, or had been taken by him; for otherwise these belonged to the ten tribes under the government of Jeroboam, and his successors, and the next clause explains it:

for they fell to him out of Israel abundance, when they saw that the Lord his God was with him; as was clear by the victory he gave him over the Ethiopians; after that time many in the above tribes came over to him; the Targum is,"when they saw the Word of the Lord his God was his help.''

And he gathered all Judah and Benjamin, and the strangers with them out of Ephraim and Manasseh, and out of Simeon: for they fell to him out of Israel in abundance, when they saw that the LORD his God was with him.

9-15. he gathered all Judah and Benjamin-Not satisfied with these minor measures of purification and improvement, Asa meditated a grand scheme which was to pledge his whole kingdom to complete the work of reformation, and with this in view he waited for a general assembly of the people.

and the strangers with them out of Ephraim and Manasseh-The population of Asa's kingdom had been vastly increased by the continued influx of strangers, who, prompted by motives either of interest or of piety, sought in his dominions that security and freedom which they could not enjoy amid the complicated troubles which distracted Israel.

and out of Simeon-Although a portion of that tribe, located within the territory of Judah, were already subjects of the southern kingdom, the general body of the Simeonites had joined in forming the northern kingdom of Israel. But many of them now returned of their own accord.

15:1-19 The people make a solemn covenant with God. - The work of complete reformation appeared so difficult, that Asa had not courage to attempt it, till assured of Divine assistance and acceptance. He and his people offered sacrifices to God; thanksgiving for the favours they had received, and supplication for further favours. Prayers and praises are now our spiritual sacrifices. The people, of their own will, covenanted to seek the Lord, each for himself, with earnestness. What is religion but seeking God, inquiring after him, applying to him upon all occasions? We make nothing of our religion, if we do not make heart-work of it; God will have all the heart, or none. Our devotedness to God our Saviour, should be avowed and shown in the most solemn and public manner. What is done in hypocrisy is a mere drudgery.