# He proclaimed

"John proclaimed"

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

John was comparing himself to a servant to show how great the one to come would be. Alternate translation: "I am not even worthy to do the lowly task of removing his shoes"

# the strap of his sandals

People often wore sandals that were made of leather and were tied to their feet with leather straps.

# stoop down

"bend down"