When we spread the gospel of Jesus Christ, we receive forgiveness for our own sins.
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The following verse applies to both the giver and receiver.
Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.
James 5:20
A related verse is
And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.
1 Peter 4:8
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Nevertheless, ye are blessed, for the testimony which ye have borne is recorded in heaven for the angels to look upon; and they rejoice over you, and your sins are forgiven you.
Doctrine & Covenants 62:3
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– Tom Irvine