Amasa’s mother was Abigail, and his father was Jether the Ishmaelite.

Elkanah’s sons: Amasai and Ahimoth,

son of Zuph, son of Elkanah,
son of Mahath, son of Amasai,

Then the Spirit took control of Amasai, chief of the Thirty, and he said:

We are yours, David,
we are with you, son of Jesse!
Peace, peace to you,
and peace to him who helps you,
for your God helps you.

So David received them and made them leaders of his troops.

The priests, Shebaniah, Joshaphat, Nethanel, Amasai, Zechariah, Benaiah, and Eliezer, were to blow trumpets before the ark of God. Obed-edom and Jehiah were also to be gatekeepers for the ark.