﴿ ۞ وَمِنْهُم مَّنْ عَٰهَدَ ٱللَّهَ لَئِنْ ءَاتَىٰنَا مِن فَضْلِهِۦ لَنَصَّدَّقَنَّ وَلَنَكُونَنَّ مِنَ ٱلصَّٰلِحِينَ ﴾

“And among them are such as vow unto God, "If indeed He grant us [something] out of His bounty, we shall most certainly spend in charity, and shall most certainly be among the righteous!"”

Please check ayah 9:78 for complete tafsir.