*** Allah Forgives the sin committed between the 2 prayers ***
Rasoollallah Sallallahu Alaihi Wasallam ne farmaya jab bhi koi Achchi tarah wudhu karta hai to aur namaz parhta hai to uskey ek Namaz se Dusri namaz ke parhney tak ke Gunnah Maaf kar diye jaatey hain
Sahih Bukhari, Vol 1, 153
I heard the Prophet Sallallahu Alaihi Wasallam saying, ‘If a man performs ablution perfectly and then offers the compulsory congregational prayer, Allah will forgive his sins committed between that (prayer) and the (next) prayer till he offers it.
Sahih Bukhari, Volume 1, Book 4, Number 161