7-Surah Al-A’raf (The Heights ) 89
We would have invented against Allah a lie if we returned to your religion after Allah had saved us from it. And it is not for us to return to it except that Allah, our Lord, should will. Our Lord has encompassed all things in knowledge. Upon Allah we have relied. Our Lord, decide between us and our people in truth, and You are the best of those who give decision.’
قَدِ افْتَرَيْنَا عَلَى اللَّهِ كَذِبًا إِنْ عُدْنَا فِي مِلَّتِكُم بَعْدَ إِذْ نَجَّانَا اللَّهُ مِنْهَا ۚ وَمَا يَكُونُ لَنَا أَن نَّعُودَ فِيهَا إِلَّا أَن يَشَاءَ اللَّهُ رَبُّنَا ۚ وَسِعَ رَبُّنَا كُلَّ شَيْءٍ عِلْمًا ۚ عَلَى اللَّهِ تَوَكَّلْنَا ۚ رَبَّنَا افْتَحْ بَيْنَنَا وَبَيْنَ قَوْمِنَا بِالْحَقِّ وَأَنتَ خَيْرُ الْفَاتِحِينَ
Quran's Tafhim ( explanation)
*73). This phrase signifies substantively what is meant by the commonly used Islamic formula In-sha' Allah ('If Allah so wills'). Its meaning is evident from al-Kahf 18: 23-4, in which the believers are directed not to make definitive statements about what they will do without making such actions contingent on God's will. This is understandable since a believer firmly believes in God's power and is ever conscious that his destiny is inalienably tied to God's will. It is impossible for such a person to make foolish statements about what he will do and what he will not do. He is bound to make it clear that he will accomplish what he intends only, if 'God so wills'.