The duty of Christ's ministers to be spiritual labourers; and the duty of Christ's churches to pray to God for such : exhibited in a sermon, from Matthew ix. 38. Preached at Dorchester, April 29, 1774. A day set apart by the church and congregation there, for solemn humiliation and supplication, to seek the divine direction and blessing in the choice and settlement of a minister among them. [Seven lines of quotations] By Samuel Dunbar, M.A. Pastor of the First Church in Stoughton.