Reb Mendel M’Riminov (1745-1815), disciple of Reb Elimelech of Lizensk) said, that saying Parshas Ha’mann (Shnayim Mikroh V’Echod Targum) on Tuesday Parshas B’Shalach, is a Segulah for Parnassah.
(Read more about it from Halachically Speaking here.)
Click HERE for the complete text of Parshas Ha’mann.
It is also quoted from Seforim saying, that one who recites this T’efillah each day, will not lack Parnassah.