Matthew 28:16-20 records that Jesus spoke to His disciples and told them to:

Matthew 28:16 - 20 KJB
[16] Then the eleven disciples went away into Galilee, into a mountain where Jesus had appointed them. [17] And when they saw him, they worshipped him: but some doubted. [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: [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.
Matthew 28:16-20

1. Go ye therefore
2. Teach all nations
3. Baptizing them (saved believers) in the name of the Father, and of the Son, and of the Holy Ghost:
4. Teaching them (saved believers) to observe all things Jesus commanded them (is optional and not for salvation but out of our love for Christ)

Matthew 28:16-20 never mention repent of sins heresy at all.

🅵🅾🅻🅻🅾🆆 ℝ𝕖𝕡𝕖𝕟𝕥𝕒𝕟𝕔𝕖 𝔼𝕩𝕒𝕞𝕚𝕟𝕖𝕕