There are only TWO verses in the Bible where the words "repent" and "sins" appear together in the Bible (and it does NOT say generically 'repent of your sins').
Both times are Peter asking Israel to repent for killing their Messiah.
Acts 2:36-39 (KJV)
(2:36) Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ. (2:37) Now when they heard [this], they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men [and] brethren, what shall we do? (2:38) Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. (2:39) For the promise is unto you, and to your children, and to all that are afar off, [even] as many as the Lord our God shall call.
Acts 3:14-21 (KJV)
(3:14) But ye denied the Holy One and the Just, and desired a murderer to be granted unto you; (3:15) And killed the Prince of life, whom God hath raised from the dead; whereof we are witnesses. (3:16) And his name through faith in his name hath made this man strong, whom ye see and know: yea, the faith which is by him hath given him this perfect soundness in the presence of you all. (3:17) And now, brethren, I wot that through ignorance ye did [it], as [did] also your rulers. (3:18) But those things, which God before had shewed by the mouth of all his prophets, that Christ should suffer, he hath so fulfilled. (3:19) Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord; (3:20) And he shall send Jesus Christ, which before was preached unto you: (3:21) Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.
I realize that you will understand NONE of this, but so be it.