سورة الأحقاف

Ali ibn Ibrahim (may Allah have mercy on him): يا قَوْمَنا أَجيبُوا داعِيَ اللهِ وَ آمِنُوا بِهِ يَغْفِرْ لَكُمْ مِنْ ذُنُوبِكُمْ وَ يُجِرْكُمْ مِنْ عَذابٍ أَليمٍ وَ مَنْ لا يُجِبْ داعِيَ اللهِ فَلَيْسَ بِمُعْجِزٍ فِي الْأَرْضِ وَ لَيْسَ لَهُ مِنْ دُونِهِ أَوْلِياءُ أُولئِكَ فِي ضَلالٍ مُبينٍ [O our people! accept the caller of Allah and believe in Him, He will forgive you your sins and protect you from a painful punishment. And whoever does not answer the caller of Allah cannot escape in the earth, and he has no protectors besides Him; those are in manifest error]. So they came to the Messenger of Allah (peace be upon him and his family) and became Muslims and [entered the religion of Islam], and the Messenger of Allah (peace be upon him and his family) taught them the practices of Islam.

Imam Ali (peace be upon him): Whoever has a need to ask from Allah, let him ask that need at three times: an hour on Friday; an hour when the sun declines from the meridian [at noon], when the wind blows, the gates of heaven open, mercy descends and the birds cry out; and an hour at the end of the night at the rising of dawn, when two angels call out: "Is there any repenter that his repentance may be accepted? Is there any petitioner that he may be granted? Is there any seeker of forgiveness that he may be forgiven? Is there anyone in need that his need may be fulfilled?" So answer the caller of Allah.