Aaishah (radhi-yAllahu 'anhaa) reported that the Messenger of Allah (sal-Allahu 'alayhe wa sallam) was given a sheep and he ordered for it's distribution. When the servant would come back [from distributing it] , 'Aaishah would ask: "What did they say?", he replied: "They would supplicate:

بَارَكَ اللَّهُ فِيكُمْ

BaarakAllahu feekum

May Allah bless you all

Reference: Ibn As-Sunni (Page 138 , Hadith no. 278). Also see, Ibnul Qaiyyum's Al Wabilus Sayyer Page 304. Tahkeek, Bashir Mamud Uyyun.