Du'a for wealth and sustenance: O Allah, O Allah, O Allah

يَا اللهُ يَا اللهُ يَا اللهُ، يَا رَبُّ يَا رَبُّ يَا رَبُّ، يَا حَيُّ يَا قَيُّومُ، يَا ذَا الْجَلَالِ وَالْإِكْرَامِ، أَسْأَلُكَ بِاسْمِكَ الْعَظِيمِ الْأَعْظَمِ أَنْ تَرْزُقَنِي رِزْقًا وَاسِعًا حَلَالًا طَيِّبًا بِرَحْمَتِكَ يَا أَرْحَمَ الرَّاحِمِينَ

Ya Allahu ya Allahu ya Allah, ya Rabbu ya Rabbu ya Rabb, ya Hayyu ya Qayyum, ya dhal-jalali wal-ikram, as'aluka bismikal-'azimil-a'zami an tarzuqani rizqan wasi'an halalan tayyiban birahmatika ya arhamar-rahimin

O Allah, O Allah, O Allah, O Lord, O Lord, O Lord, O Ever-Living, O Sustainer, O Possessor of Majesty and Honour, I ask You by Your great and supreme name to grant me a vast, lawful, and good provision by Your mercy, O Most Merciful of the merciful.

A general supplication, not a narration from the Prophet (peace be upon him).