Tafsir of Al-Baqarah 2:270

Allah says;

وما أنفقتم من نفقة أو نذرتم من نذر فٳن الله يعلمه

And whatever you spend for spendings (e.g., in Sadaqah) or whatever vow you make, be sure Allah knows it all. Allah states that He has perfect knowledge of the good deeds performed by all of His creation, such as charity and various vows, and He rewards tremendously for these deeds, provided they are performed seeking His Face and His promise. Allah also warns those who do not work in his obedience, but instead disobey His command, reject His revelation and worship others besides Him:

وما للظالمين من أنصار

And for the wrongdoers there are no helpers. meaning, who will save them from Allah's anger and torment on the Day of Resurrection. The Virtue of Disclosing or Concealing Charity Allah said,