Surat Al-Ankaboot (The Spider) - العنكبوت

وَمِنَ ٱلنَّاسِ مَن يَقُولُ ءَامَنَّا بِٱللَّهِ فَإِذَآ أُوذِىَ فِى ٱللَّهِ جَعَلَ فِتْنَةَ ٱلنَّاسِ كَعَذَابِ ٱللَّهِ وَلَئِن جَآءَ نَصْرٌ مِّن رَّبِّكَ لَيَقُولُنَّ إِنَّا كُنَّا مَعَكُمْ أَوَلَيْسَ ٱللَّهُ بِأَعْلَمَ بِمَا فِى صُدُورِ ٱلْعَٰلَمِينَ ﴿١٠﴾

And among men is he who says: We believe in Allah; but when he is persecuted in (the way of) Allah he thinks the persecution of men to be as the chastisement of Allah; and if there come assistance from your Lord, they would most certainly say: Surely we were with you. What! is not Allah the best knower of what is in the breasts of mankind.