Examples of kneeling in Prayer.

Jesus:

Luke 22:41 

And he was withdrawn from them about a stone's cast, and kneeled down, and prayed,

Stephen:

Acts 7:60 

And he kneeled down, and cried with a loud voice, Lord, lay not this sin to their charge. And when he had said this, he fell asleep.

Peter:

Acts 9:40 

But Peter put them all forth, and kneeled down, and prayed; and turning him to the body said, Tabitha, arise. And she opened her eyes: and when she saw Peter, she sat up.

Paul:

Acts 20:36 

And when he had thus spoken, he kneeled down, and prayed with them all.

Acts 21:5 

And when we had accomplished those days, we departed and went our way; and they all brought us on our way, with wives and children, till we were out of the city: and we kneeled down on the shore, and prayed.

Ephesians 3:14 

For this cause I bow my knees unto the Father of our Lord Jesus Christ,