1 Kings 12:2

And it came to pass, when Jeroboam the son of Nebat, who was yet in Egypt, heard of it, (for he was fled from the presence of king Solomon, and Jeroboam dwelt in Egypt;)

Cross-reference

1 Kings 11:26-31 recounts Ahijah's prophecy that Jeroboam would rule ten tribes, explaining why he was a threat and fled to Egypt.

1 Kings 11:40 states Solomon sought to kill Jeroboam, the immediate cause of his flight to Egypt mentioned here.

2 Chronicles 10:2 is the parallel account of Jeroboam returning from Egypt upon hearing of Solomon's death.