Where has Christ promised us, that he will as certainly wash us by his blood and Spirit, as we are washed with the water of baptism?

In the institution of baptism, which is thus expressed: "Go ye, therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost", Matt.28:19. And "he that believeth, and is baptized, shall be saved; but he that believeth not, shall be damned.", Mark 16:16. This promise is also repeated, where the scripture calls baptism "the washing of regenerations" and the washing away of sins. Tit.3:5, Acts 22:16. (a)

(a) Tit.3:5 Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; Acts 22:16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.