Muwatta Malik #22

Yahya related to me from Malik from Yahya ibn Said that once Umar ibn al-Khattab left after doing the asr prayer and met a man who had not been there. Umar asked him what had kept him from the prayer and eventhough the man gave a good reason, Umar said, "You have given yourself short measure." Yahya added that Malik commented, "It is said that everything has a short measure and a full measure."