And those who had set their hearts to seek the LORD God of Israel came after them from all the tribes of Israel to Jerusalem to sacrifice to the LORD, the God of their fathers.
See here, I. How Rehoboam was strengthened by the accession of the priests and Levites, and all the devout and pious Israelites, to him, even all that were true to their God and their religion. 1. Jeroboam cast them off, that is, he set up such a way of worship as he knew they could not in conscience comply with, which obliged them to withdraw...
Commenting on 2 Chronicles 11:13-23
And Rehoboam took him Mahalath, the daughter of Jerimoth, the son of David, to wife,.... Of which son of David we nowhere else read; perhaps he might be the son of one of his concubines, or he might have two names: and Abihail the daughter of Eliab the son of Jesse; who was David's eldest brother. Sa1 17:13. She must be a granddaughter or great-granddaughter of his.
And after them out of all the tribes of Israel such as set their hearts to seek the LORD God of Israel came to Jerusalem, to sacrifice unto the LORD God of their fathers. (e) Who were zealous of true religion and feared God.