Seek Repentance Straight Away

Surah Al-Infitar, Verse 10:
وَإِنَّ عَلَيْكُمْ لَحَافِظِينَ
But verily, over you (are appointed angels in charge of mankind) to watch you[] , Surah Al-Infitar, Verse 11:
كِرَامًا كَاتِبِينَ
Kirâman (honourable) Kâtibîn writing down (your deeds)[] , Surah Al-Infitar, Verse 12:
يَعْلَمُونَ مَا تَفْعَلُونَ
They know all that you do.
Surah Al-Infitar, Verse 13:
إِنَّ الْأَبْرَارَ لَفِي نَعِيمٍ
Verily, the Abrâr (pious and righteous) will be in delight (Paradise); Reference: Sahih Bukhari (English),Volume 04,54. Begining of Creation,Hadith 446:-

Narrated Abu Huraira:( May Allah be pleased with him)

The Prophet said, "Angels keep on descending from and ascending to the Heaven in turn, some at night and some by daytime, and all of them assemble together at the time of the Fajr and `Asr prayers. Then those who have stayed with you over-night, ascent unto Allah Who asks them, and He knows the answer better than they, "How have you left My slaves?" They reply, "We have left them praying as we found them praying." If anyone of you says "Amin" (during the Prayer at the end of the recitation of Surat-al-Faitiha), and the angels in Heaven say the same, and the two sayings coincide, all his past sins will be forgiven."
Reference: Sahih Bukhari (English),Volume 08,76. Softening the Heart,Hadith 498:-

Narrated Ibn `Abbas:( may Allah be pleased with him)

The Prophet narrating about his Lord I'm and said, "Allah ordered (the appointed angels over you) that the good and the bad deeds be written, and He then showed (the way) how (to write). If somebody intends to do a good deed and he does not do it, then Allah will write for him a full good deed (in his account with Him); and if he intends to do a good deed and actually did it, then Allah will write for him (in his account) with Him (its reward equal) from ten to seven hundred times to many more times: and if somebody intended to do a bad deed and he does not do it, then Allah will write a full good deed (in his account) with Him, and if he intended to do it (a bad deed) and actually did it, then Allah will write one bad deed (in his account) ."