If somebody have sworn on Quran about not doing something but couldn't control later, what should he do for forgiveness?

One should avoid taking an oath (Qasm) unnecessarily. If one took an oath, he/she should fulfil the oath. To go against the oath is a major sin.

Allah is Most Gracious and Most Merciful. He says in the Noble Qur'aan, 'Oh My Slaves! Do not despair. Verily Allah will forgive all sins.'

In one Hadith, Rasulullah (Sallallaahu Alayhi Wasallam) is reported to have said, 'If a person has sins equivalent to the foams of the sea and pebbles on a desert, Allah's mercy is so encompassing that He will forgive every sin.' In another narration, it is mentioned that Allah will speak secretly to one of His slaves on the day of Qiyaamat and remind him of all his sins. After the person will confess his sins, Allah will say to him, 'I concealed your faults in the world, today too, I will conceal your faults. Go in Jannah, I have forgiven you.'

The above mentioned are few of many Ahaadith explaining the extent of Allah's Mercy. However, Allah says, 'Verily Allah will not forgive a person who ascribe partners (commit Shirk) with Him.' The only sin that is unforgivable is Kufr (disbelief) and Shirk (ascribing partners). Accepting Islam is the only atonement for the sin of Kufr and Shirk.

If one fulfils the conditions of repentance, i.e. regret and make firm intention to reform, then surely Allah Ta'ala is Tawwaab (Most Forgiving)

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai