Matthew 6:3 in the King James Version
But when thou doest alms, let not thy left hand know what thy right hand doeth:
Context
2 Therefore, when you do merciful deeds, don’t sound a trumpet before yourself, as the hypocrites do in the synagogues and in the streets, that they may get glory from men. Most certainly I tell you, they have received their reward.
3 But when you do merciful deeds, don’t let your left hand know what your right hand does,
4 so that your merciful deeds may be in secret, then your Father who sees in secret will reward you openly.