Mark 1:7

And she arose and bowed with her face to the ground and said, “Behold, your maidservant is a servant-woman to wash the feet of my lord’s servants.”

“This One is He who comes after me, of whom I am not worthy to untie the strap of His sandal.”

“And as John was fulfilling his course, he kept saying, ‘What do you suppose that I am? I am not He. But behold, one is coming after me of whom I am not worthy to untie the sandals of His feet.’

Then Paul said, “John baptized with the baptism of repentance, telling the people to believe in Him who was coming after him, that is, in Jesus.”