Surat At-Tawba (The Repentance) - التوبة

وَمِنْهُم مَّنْ عَٰهَدَ ٱللَّهَ لَئِنْ ءَاتَىٰنَا مِن فَضْلِهِۦ لَنَصَّدَّقَنَّ وَلَنَكُونَنَّ مِنَ ٱلصَّٰلِحِينَ ﴿٧٥﴾ فَلَمَّآ ءَاتَىٰهُم مِّن فَضْلِهِۦ بَخِلُوا۟ بِهِۦ وَتَوَلَّوا۟ وَّهُم مُّعْرِضُونَ﴿٧٦﴾

And there are those of them who made a covenant with Allah: If He give us out of His grace, we will certainly give alms and we will certainly be of the good. But when He gave them out of His grace, they became niggardly of it and they turned back and they withdrew.