Matthew 6:3

Let not thy left hand know what thy right hand doeth.

A strong expression to indicate that there must be no publishing of our alms deeds, and that secrecy rather that publicity must be sought.

That thine alms may be in secret.

It is not concealment that is required, so much as to avoid ostentation. Some men will refuse to give unless they are assured that the list of givers will be published. Such give for the praise of men, and they have their reward. But to him who gives from the right motive it matters little if the deed is concealed from all men; God sees it, and will, in due time, openly reward it.

Openly.

Literally, "in the open place," in the last day, when every secret thing is made manifest.