1 Chronicles 7:20

Bared, Thahath, probably called Becher and Theken, in Numbers. Three alone are there mentioned, though the other thirteen, whose names are given, seem to have been all the immediate sons of Ephriam, (Calmet) since he mourns for them, (ver. 22.; Menochius) and his other children afterwards. (Haydock) --- The dreadful slaughter made them, is perhaps the reason why only three are mentioned in Numbers, and none in Genesis.