G3338–μεταμέλλομαι–metamellomai

He answered, 'I will not,' but afterward he changed his mind, and went.

μεταμεληθεὶς metamelētheis “having repented”

For John came to you in the way of righteousness, and you didn't believe him, but the tax collectors and the prostitutes believed him. When you saw it, you didn't even repent afterward, that you might believe him.

μετεμελήθητε metemelēthēte “did repent”

Then Judas, who betrayed him, when he saw that Jesus was condemned, felt remorse, and brought back the thirty pieces of silver to the chief priests and elders,

μεταμεληθεὶς metamelētheis “having regretted [it]”

For though I made you sorry with my letter, I do not regret it, though I did regret it. For I see that my letter made you sorry, though just for a while.

μεταμέλομαι· metamelomai “I do regret [it];”μετεμελόμην, metemelomēn “I was regreting [it],”

(for they indeed have been made priests without an oath), but he with an oath by him that says of him, "The Lord swore and will not change his mind, 'You are a priest forever, According to the order of Melchizedek'".

μεταμεληθήσεται· metamelēthēsetai “will change His mind;”