Matthew 28:18–20
18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. 19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: teach...: or, make disciples, or, Christians of all nations 20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
In the original: βαπτίζω baptizō G907 — From a derivative of G911; to make whelmed (that is, fully wet); used only (in the New Testament) of ceremonial ablution, especially (technically) of the ordinance of Christian baptism: - baptist, baptize, wash.
See also: Mark 16:15 · Acts 2:38 · John 3:35 · Acts 1:8