Mr 1:7

Mr 1:7 And preached, saying, There cometh one mightier than I after me, the latchet of whose shoes I am not worthy to stoop down and unloose.

John references the verses that follow Mal 3:1 in describing the one who follows him. He doesn't quote the verses but restates their meaning:

mightier than I

Mal 3:2 But who may abide the day of his coming? and who shall stand when he appeareth? for he [is] like a refiner’s fire, and like fullers’ soap:

He is mightier: Who can live through the day of his coming?

He is mightier: Who can stand in his presence? "Every knee will bow.."

He is mightier: He will clean the essence and the outside.

Mal 3:3 And he shall sit [as] a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness.

Php 2:10 That at the name of Jesus every knee should bow, of [things] in heaven, and [things] in earth, and [things] under the earth;

Isa 1:18 Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.