Exodus 17:12
"But Moses’ hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun."
Cross References (ranked by relevance)
Strengthen ye the weak hands, and confirm the feeble knees.
For I know that this shall turn to my salvation through your prayer, and the supply of the Spirit of Jesus Christ,
Wherefore lift up the hands which hang down, and the feeble knees;
Ye also helping together by prayer for us, that for the gift bestowed upon us by the means of many persons thanks may be given by many on our behalf.
Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
Brethren, pray for us.
Continue in prayer, and watch in the same with thanksgiving;
Draw out also the spear, and stop the way against them that persecute me: say unto my soul, I am thy salvation.
But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.