See Hard Sayings of the Bible p.404-406 for a more extensive answer. Q: In Mk 1:4,9 and Lk 3:3, since baptism was for the forgiveness / remission of sins, why was Jesus baptized, since Jesus was sinless according to Hebrews 4:15; 2 Corinthians 2:5:21, John 8:46, and 1 Peter 1:19?
S: Kwenye Mak 1:4, 9 na Luk 3:3, kwa kuwa ubatizo ulikuwa kwa msamaha/ondoleo la dhambi, kwa nini Yesu alibatizwa, kwa sababu yeye hakuwahi kutenda dhambi kwa mujibu wa Waebrania 4:15; 2 Korintho; 2:5:21, Yohana 8:46, na 1 Peter 1:19?