Reference for I Kings 11:42

וְהַיָּמִ֗ים אֲשֶׁר֩ מָלַ֨ךְ שְׁלֹמֹ֤ה בִירוּשָׁלִַ֙ם֙ עַל־כָּל־יִשְׂרָאֵ֔ל אַרְבָּעִ֖ים שָׁנָֽה׃

And the time that Solomon reigned in Jerusalem over all Israel was forty years.

BDB