Sahih Adab al-Mufrad

Sayyiduna Anas bin Malik (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) was very compassionate. When anyone came to him (for their need), he would make a promise to them and fulfill it, provided he had it with him. (Once) the iqamah for prayer was given and a Bedouin came to the Prophet (peace and blessings be upon him), grabbed his garment, and said: "I have a small need left, I fear I might forget it." The Prophet (peace and blessings be upon him) went with him until his need was fulfilled, and then returned and led the prayer.