en_tn/mrk/01/07.md

He preached

John (Mark 1:1) preached

I am not worthy even to stoop down to untie the strap of his sandals

John is saying that he does not deserve to do the most unpleasant work of a servant. (See: rc://en/ta/man/translate/figs-metaphor)

stoop down

"bend down"

baptize you with the Holy Spirit

Spiritual baptism brings people into contact with the Holy Spirit like water baptism brings people into contact with water. (See: rc://en/ta/man/translate/figs-metaphor)