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ʾin tubdū ṣ-ṣadaqāti fa-niʿimmā hiya wa-ʾin tukhfūhā wa-tuʾtūhā l-fuqarāʾa fa-huwa khayrun lakum wa-yukaffiru ʿankum min sayyiʾātikum wa-llāhu bi-mā taʿmalūna khabīrun
If you disclose your charities, that is well, but if you hide them and give them to the poor, that is better for you, and it will atone for some of your misdeeds, and Allah is well aware of what you do.
— Ali Quli Qarai
Surah Al-Baqarah, Verses 270 - 271
270. "And whatever you spend in charity, or (whatever) vow you vow, surely Allah knows it. While, there will be no helpers for the unjust."
271. "If you give alms openly, it is well; but if you hide it and give it to the poor, it is better for you, and it will remove from you some of your sins; and Allah is aware of what you do."
Spending in charity, here, means whatever you spend in the way of Allah or in the way of Satan.
Or, whatsoever you have made obligatory to yourself by the way of vow, whether it be alongside the path of obedience of Allah or for committing sins, He knows it.
Verily, your deed is not concealed to Allah, and He will reward you according to it.
The objective meaning of 'unjust' here, is those who spend their wealth in the way of disobedience of Allah and committing sins. They do not give the alms of their property; or do not fulfil what they have vowed; or they vow to do that which is sin. For such people, there will be no friend who can save them from the Divine Judgment or prevent His punishment.
That is, if you give your alms hiddenly to the indigents 'it is better for you', viz., giving alms hiddenly is better for you: and its due reward is better and more. The purpose of alms that the concealment of which is better is the recommended alms, because making the obligatory alms manifest is more reasonable.