Deuteronomy 33:9 in the King James Version
Who said unto his father and to his mother, I have not seen him; neither did he acknowledge his brethren, nor knew his own children: for they have observed thy word, and kept thy covenant.
Context
8 About Levi he said, “Your Thummim and your Urim are with your godly one, whom you proved at Massah, with whom you contended at the waters of Meribah.
9 He said of his father, and of his mother, ‘I have not seen him.’ He didn’t acknowledge his brothers, nor did he know his own children; for they have observed your word, and keep your covenant.
10 They shall teach Jacob your ordinances, and Israel your law. They shall put incense before you, and whole burnt offering on your altar.