In the months before he went to Amherst, Ohio, Joseph Smith was busy translating the Bible. On Dec. 1, 1831, he received a revelation (Section 71) at Hiram, Ohio, in which he and Sidney Rigdon were told they were to proclaim the gospel, ". . . expounding the mysteries thereof out of the scriptures. . . . " (D&C 71:1.)
In History of the Church 1:239, the Prophet wrote of that instruction: "Knowing now the mind of the Lord, that the time had come that the Gospel should be proclaimed in power and demonstration to the world, from the Scriptures, reasoning with men as in the days of old, I took a journey to Kirtland, in company with Elder Sidney Rigdon on the 3rd day of December, to fulfil the above revelation."After they left Kirtland, about Dec. 8 or 10, 1831, Joseph and Sidney preached in other communities, including Amherst.
Of the gathering in Amherst, the Prophet wrote: "The elders seemed anxious for me to inquire of the Lord that they might know His will, or learn what would be most pleasing to Him for them to do, in order to bring men to a sense of their condition. . . ." (HC 1:242-243.)
The Prophet received the revelation now recorded as Section 75, in which a number of elders were called to the ministry, some to specific regions in the United States.
In The Doctrine and Covenants Speaks, Vol. 2, Roy W. Doxey wrote: "The opening verses of Section 75 may be applied to the thousands of missionaries of this dispensation. In these five verses the missionary is commissioned to proclaim the Lord's gospel in earnestness, eschewing idleness, and to be mighty in that proclamation. The earnest missionary's message should be delivered as the sound of a trumpet. This expression alludes to the sounds of this instrument that can be heard far and wide with mighty blasts. . . .
"Missionaries are promised by the Lord that if they labor faithfully, they `shall be laden with many sheaves, and crowned with honor, and glory, and immortality, and eternal life.' " (D&C 75:5.)