Verses with the word mankind in the Old Testament (3 verses):

Leviticus 18:22
Thou shalt not lie with mankind, as with womankind: it is abomination.

Leviticus 20:13
If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.

Job 12:10
In whose hand is the soul of every living thing, and the breath of all mankind.