JMNT(i)
21 From that time on, Jesus [other MSS: Jesus Christ] began to progressively point out, exhibit and demonstrate to and for His disciples that it is necessary [for] Him – even continues being binding [on] Him – to go away into Jerusalem, and to experience and suffer many things from the elders and chief (or: ranking) priests, as well as the scribes (scholars and theologians of the Law), and then to be killed off – but also to be aroused and raised up on (or: during) the third day.
22 And so Peter, taking Him to himself, began to then be respectfully admonishing Him, expressing increased value of Him, repeatedly saying, "Merciful covering on You (or: [Be] kind and merciful to Yourself; [There is] favorable shelter for You; or: = [Heaven be] propitiously merciful to You; = May God spare You), O Lord (Master)! By no means will this be for You!"
23 Now, being turned, He said to Peter, "Proceed leading the way (or: bringing things under control) behind Me, O adversary. You are My bait-stick, ensnaring and leading Me into a trap, because you are not in the habit of setting your mind on or having the attitude pertaining to the things of God, but instead, [you continually have opinions which align with] the things of humans (or: mankind)."
24 At that point Jesus said to His disciples, "If anyone continues intending (purposing; willing; wanting) to come on behind Me, let him at once deny, reject and disown himself, and then in one move lift up his execution state (cross), and after that proceed to be by habit continuously following after Me!
25 "You see, whoever may intend (or: should purpose; might set his will; happens to want) to keep his soul-life safe (to rescue himself; to preserve the interior life that he is living) will continue loosing-it-away and destroying it. Yet whoever can loose-away and even destroy his soul-life (the interior self) on My account, he will continue finding it!