Context: Jesus, in the Sermon on the Mount, first explains that the Kingdom of God is reached by those who trust in the Almighty, and then says that He has come to fulfill the old law, not to destroy it. Speaking of the reward in Heaven of the faithful, He compares the old laws with the new and exhorts the people to be perfect, as God is perfect. Warning them against pride in their religious practices, He admonishes them not to be like the almsgivers who announce loudly their gifts:
But when thou doest alms, let not thy left hand know what thy right hand doeth:
That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.