It has been narrated from Imam Jafar Sadiq; In the Name of Allah, the All-beneficent the All-merciful. You may say the following (supplicatory prayer) each day in Rajab; in mornings, evenings, and after each of the obligatory prayers:
يَا مَنْ ارْجُوهُ لِكُلِّ خَيْرٍ
Yaa Man Arjoohoo Likulli Khayr
O He Whom alone I hope for all good things
وآمَنُ سَخَطَهُ عِنْدَ كُلِّ شرٍّ
Wa-Aamanu Sakhatahoo `Inda Kulli Sharr
and Whose wrath I do not expect when I do wrong!
يَا مَنْ يُعْطِي ٱلْكَثِيرَ بِٱلْقَلِيلِ
Yaa Manyu`Til-Katheera Bil-Qaleel
O He Who recompenses the little deed with very much reward!
يَا مَنْ يُعْطَي مَنْ سَالَهُ
Yaa Manyu`Tee Man Sa-Alah
O He Who answers one who begs Him!