1 Kings 11:4
because as Solomon grew older, his wives turned his affections away after other gods, and his heart was not fully as devoted to the LORD his God as his father David's heart had been.
1 Kings 11:6
Solomon practiced what the LORD considered to be evil by not fully following the LORD, as had his father David.
1 Kings 15:3
He practiced the same sins that his father committed before he was born. Unlike his ancestor David, his heart never became devoted to the LORD his God.
For their hearts weren't committed to him, and they weren't faithful to his covenant.
Yet in all this her treacherous sister Judah didn't return to me with her whole heart, but rather deceptively," declares the LORD.
but since he doesn't have any root in himself, he lasts for only a short time. When trouble or persecution comes along because of the word, he immediately falls away.