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Surah 7. Al-A'raf
Ayah 88 - 89
88 قَالَ ٱلْمَلَأُ ٱلَّذِينَ ٱسْتَكْبَرُوا۟ مِن قَوْمِهِۦ لَنُخْرِجَنَّكَ يَـٰشُعَيْبُ وَٱلَّذِينَ ءَامَنُوا۟ مَعَكَ مِن قَرْيَتِنَآ أَوْ لَتَعُودُنَّ فِى مِلَّتِنَا ۚ قَالَ أَوَلَوْ كُنَّا كَـٰرِهِينَ
89 قَدِ ٱفْتَرَيْنَا عَلَى ٱللَّهِ كَذِبًا إِنْ عُدْنَا فِى مِلَّتِكُم بَعْدَ إِذْ نَجَّىٰنَا ٱللَّهُ مِنْهَا ۚ وَمَا يَكُونُ لَنَآ أَن نَّعُودَ فِيهَآ إِلَّآ أَن يَشَآءَ ٱللَّهُ رَبُّنَا ۚ وَسِعَ رَبُّنَا كُلَّ شَىْءٍ عِلْمًا ۚ عَلَى ٱللَّهِ تَوَكَّلْنَا ۚ رَبَّنَا ٱفْتَحْ بَيْنَنَا وَبَيْنَ قَوْمِنَا بِٱلْحَقِّ وَأَنتَ خَيْرُ ٱلْفَـٰتِحِينَ
[88-89] The chiefs of his tribe, who were puffed up with pride, said to him, "O Shu`aib, we will banish you and those who have believed with you from our city, or you shall have to return to our fold." Shu`aib replied,"What! Will you turn us back forcibly to it, even if we abhor it? We shall be guilty of attributing a lie to Allah, if we return to your creed, after Allah has delivered us from it; nor can we now return to your creed, except that Allah, our Lord, wills it;73 the knowledge of our Lord embraces everything; in Allah we put our trust, Our Lord, judge with truth between us and our people, and Thou art the best of judges."
73Prophet Shu'aib hastened to add these words to show that he could not claim with certainty even this much that they would not return to the creed of the disbelievers. A believer who rightly and fully comprehends the significance of the power of Allah, knows that it is His Will that prevails over everything. Therefore he cannot claim with certainty, "I will do this or I will not do this, for the fulfillment of this or that depends entirely on the will of my Lord. If He will, I shall become successful, otherwise I shall fail in it."
Allah has taught the same thing in XVIII: 23-24:
"Never say about anything, 'I will do this tomorrow, for you cannot do anything, but say, If it be Allah's Will'."