Exodus 17:11: When Moses held tip his hand, Israel, &c

Long as our hands are lifted up.
We triumph o'er sin, earth, and hell;
But when in prayer we faint and droop,
Our rallying foes again prevail:
O Thou whose hand is stretch'd out still.
Our sinking hands confirm, and stay,
And wrestle for us on the hill,
And in us here incessant pray.
Exodus xvii. lO — xx. i.