Surah Yunus, Ayat 29-30

Ayat 29. "So sufficient is Allah for a witness between us and you, that We indeed knew nothing of your worship of us."

Ayat 30. There! Every person will know (exactly) what (all) he had earned before, and they will be brought back to Allah, their rightful Lord, and their invented false deities will vanish from them.

Hazrat Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah   [SAWW](PBUH) said, "O people! Allah is Pure and, therefore, accepts only that which is pure. Allah has commanded the believers as He has commanded His Messengers by saying: `O Messengers! Eat of the good things, and do good deeds.' (23:51) And He said: `O you who believe (in the Oneness of Allah - Islamic Monotheism)! Eat of the lawful things that We have provided you...''' (2:172). Then he   [SAWW](PBUH) made a mention of the person who travels for a long period of time, his hair are dishevelled and covered with dust. He lifts his hand towards the sky and thus makes the supplication: `My Rubb! My Rubb!' But his food is unlawful, his drink is unlawful, his clothes are unlawful and his nourishment is unlawful, how can, then his supplication be accepted?''

[Muslim Hadith # 2214].  

Lesson : as mentioned above in Surah Yunus Ayat 20. ""The unseen belongs to Allah Alone, so wait you, verily I am with you among those who wait (for Allah's Judgment)." This Hadith shows the value of the honest earning, for the grant of prayer, honest earning is essential. Allah accepts charity only if it has been earned in an honest way. Moreover, before any pious action, honest earning for living is essential; otherwise good actions will also go waste.