Exodus 17:11

And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed.

Cross References

1 Timothy 2:8 I will therefore that men pray every where, lifting up holy hands, without wrath and doubting.
James 5:16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
Psalms 56:9 When I cry unto thee, then shall mine enemies turn back: this I know; for God is for me.
Luke 18:1 And he spake a parable unto them to this end, that men ought always to pray, and not to faint;