Sayyiduna Abdullah bin Busr (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) passed by my father while he (peace and blessings be upon him) was riding his white mule. My father came and took hold of the reins of his mule and said: "Stay with us." He said: He (peace and blessings be upon him) stopped with us, and dates and sawiq were brought. He (peace and blessings be upon him) was eating the dates, placing the stones on the back of his index finger or middle finger, or on both, and then throwing them away. He said: Then they prepared food for him (peace and blessings be upon him), and he (peace and blessings be upon him) ate. After that a cup of milk or sawiq was brought; he (peace and blessings be upon him) drank, then gave it to the one on his (peace and blessings be upon him) right. When he (peace and blessings be upon him) intended to set off or depart, they said: "Supplicate for us." So the Messenger of Allah (peace and blessings be upon him) said: 'Allahumma barik lahum fima razaqtahum, waghfir lahum warhamhum' (O Allah, bless them in what You have provided them, forgive them and have mercy on them).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14598