The duty and reward of propagating principles of religion and virtue exemplified in the history of Abraham : a sermon preach'd before the Trustees for establishing the colony of Georgia in America : and before the Associates of the late Rev. Dr. Thomas Bray for converting the negroes in the British plantations, and for other good purposes : at their anniversary-meeting in the parish church of St. Mary-le-Bow : on Thursday March 15, 1732.