And said this for three times in every morning and in evening:

اَللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْكُفْرِ وَالْفَقْرِ اَللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ لَا إِلَهَ إِلَّا أَنْتَ

Allaahumma 'innee 'a'oodhu bika minal-kufri, wal-faqr, Allaahumma 'innee 'a'oodhu bika min 'adhaabil-qabr, laa 'ilaaha 'illaa 'Anta

O Allah, I seek refuge in You from disbelief and poverty. O Allah! I seek refuge in You from the punishment of the grave. There is none worthy of worship but You. He said: I heard the Messenger of Allah (ﷺ) using these words as a supplication and I like to follow his sunnah.

Reference: Hasan. Abu Dawud: 5090