The Prophet SAW said, “The chief of prayers for forgiveness is:Allahumma anta rabbee la ilaha illa anta, khalaqtanee wa-ana ‘abduka, wa-ana ‘alaa ‘ahdika wawa’dika mas-tata’tu, a’oothu bika min sharri ma sana’tu, aboo-o laka bini’matika ‘alaya, wa-aboo-o bizambee, faghfir lee zunoobi fa-innahu la yaghfiruz-zunooba illa anta (‘O Allah, You are my Lord, none has the right to be worshiped except You, You created me and I am Your servant and I abide to Your covenant and promise [to honor it] as best I can, I take refuge in You from the evil of which I committed. I acknowledge Your favor upon me and I acknowledge my sin, so forgive me, for verily none can forgive sins except You.). (sahih Bukhari)
The Prophet pbuh added, “If somebody recites it during the day with firm faith in it and dies on the same day before the evening, he will be from the people of Paradise and if somebody recites it at night with firm faith in it and dies before the morning he will be from the people of Paradise.” (sahih Bukhari)
Abu Musa Al-Ash`ari (May Allah be pleased with him) reported: I asked the Messenger of Allah (PBUH): "Who is the most excellent among the Muslims?'' He said, "One from whose tongue and hands the other Muslims are secure.'' [Sahih Bukhari and Muslim].
683. Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, "Iman has sixty odd or seventy odd branches. The uppermost of all these is the Testimony of Faith: `La ilaha illallah' (there is no true god except Allah) while the least of them is the removal of harmful object from the road. And shyness is a branch of Iman.''
[Sahih Bukhari and Muslim].
Commentary: This Hadith has already occurred in a previous chapter, see commentary on Hadith No. 125. Here it has been repeated with reference to the degrees of Faith. Modesty, too, is a part of Faith, rather one of its most important ingredients, because it plays an effective role in the training and sublimation of human psyche. (Riyadus Salihiin)