1 Kings 11:43

Slept — This expression is promiscuously used concerning good and bad; and signifies only, that they died as their fathers did. But did he repent before he died? This seems to be put out of dispute by the book of Ecclesiastes; written after his fall; as is evident, not only from the unanimous testimony of the Hebrew writers, but also, from the whole strain of that book, which was written long after he had finished all his works, and after he had liberally drunk of all sorts of sensual pleasures, and sadly experienced the bitter effects of his love of women, Ecclesiastes 7:17, &c. which makes it more than probable, that as David writ Psalms 51:1. So Solomon wrote this book as a publick testimony and profession of his repentance.