The Holy Quran 2:270 — Surah Al-Baqarah

Arabic text

وَمَآ أَنفَقْتُم مِّن نَّفَقَةٍ أَوْ نَذَرْتُم مِّن نَّذْرٍ فَإِنَّ ٱللَّهَ يَعْلَمُهُۥ ۗ وَمَا لِلظَّـٰلِمِينَ مِنْ أَنصَارٍ

Translation

Whatever charity you spend or oaths you vow, surely Allaah is Aware of them (whether the charity is a little or a lot, whether the intentions are good or evil, whether the act is secret or public). The oppressors (those who are miserly and who spend their wealth against Allaah's orders) shall have no helper (against Allaah's punishment). (One should therefore not take vows in anyone's name besides Allaah's.)

Tafsir (excerpt) — Tafsir Usmani

On vows: that is, whatever charity is given, little or much, with a good intention or a bad one, secretly or to be seen by people, or whatever kind of vow is made, Almighty Allah certainly has full knowledge of it all. And those who act against the command of Allah in spending wealth and in vows have no helper; Allah will punish them as He wills.

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