Luke 22:44 in the King James Version
And being in an agony he prayed more earnestly: and his sweat was as it were great drops of blood falling down to the ground.
Context
43 An angel from heaven appeared to him, strengthening him.
44 Being in agony, he prayed more earnestly. His sweat became like great drops of blood falling down on the ground.
45 When he rose up from his prayer, he came to the disciples and found them sleeping because of grief,