1 “Be careful not to display your righteousness merely to be seen by people. Otherwise you have no reward with your Father in heaven. 2 Thus whenever you do charitable giving, do not blow a trumpet before you, as the hypocrites do in synagogues and on streets so that people will praise them. I tell you the truth, they have their reward! 3 But when you do your giving, do not let your left hand know what your right hand is doing, 4 so that your gift may be in secret. And your Father, who sees in secret, will reward you. 5 “Whenever you pray, do not be like the hypocrites because they love to pray while standing in synagogues and on street corners so that people can see them. Truly I say to you, they have their reward! 6 But whenever you pray, go into your inner room, close the door, and pray to your Father in secret. And your Father, who sees in secret, will reward you.

It is the type in which one gives the charity without knowing to whom he gave it, and the other one takes it without knowing from whom he took it. The Gemara explains: One gives it without knowing to whom he gave it, this serves to exclude the practice of Mar Ukva, who would personally give charity to poor people without their knowing he was the donor. The other one takes it without knowing from whom he took it; this serves to exclude the practice of Rabbi Abba, who would render his money ownerless, so that poor people would come and take it without his knowing whom he helped, although they would know from whom the money came. The Gemara asks: Rather, how then should one act to conceal his own identity and also remain ignorant of the identities of the recipients? The Gemara answers: The best method is to put the money into the charity purse.