sentences:  In 1815 he began to travel regularly to Rabbi Dovber of Lubavitch and, after the latter’s passing, became a disciple of Rabbi Dovber's successor, Rabbi Menachem Mendel.Jewish agricultural settlement in the Kherson Governorate area had been initiated and encouraged by Rabbi Dovber.In 1818 Rabbi Dovber instructed Rabbi Hillel to visit these colonies regularly, saying, "Harvest material (gather funds for those in need) and sow spiritual (guide and inspire the colonists)."