There are five (5) prayers which must be performed by the accountable Muslims and are called “obligatory” prayers. It is a great sin to neglect performing any of these obligatory prayers. Among the merits of performing the obligatory prayers is that one’s small sins, which may be committed between prayers, are forgiven. The Prophet may Allah raise his rank, said:
( مَنْ تَوَضَّأَ ، فَأَحْسَنَ الْوُضُوءَ خَرَجَتْ خَطَايَاهُ مِنْ جَسَدِهِ حَتَّى تَخْرُجَ مِنْ تَحْتِ أَظْفَارِهِ ) رواه مسلم.
It means: “Whoever makes a complete wudu‘, his sins will depart his body, until they leave from under his nails” (Muslim).