Zakhira-e-Aakhirat – The Only Wealth That Lasts

It seems you are looking for a of the book "Zakhira-e-Aakhirat" (ذخیرہ آخرت), which translates to "Treasure for the Hereafter" . This is a well-known Islamic Urdu book focusing on virtues of worship, afterlife preparation, and salvation.