Jami` at-Tirmidhi Book 48, Hadith 178
“O Allah, cool my heart with snow and hail and cold water. O Allah, cleanse my heart of sins as You cleanse a white garment of filth (Allāhumma barrid qalbī bith-thalji wal-baradi wal-mā’il-bārid. Allāhumma naqqi qalbī min al-khaṭāyā kamā naqqaitath-thawbal-abyaḍa min ad-dannas).”
“The stingy person is the one before whom I am mentioned, and he does not send Salat upon me.”
“Whomsoever of you the door of supplication is opened for, the doors of mercy have been opened for him. And Allah is not asked for anything - meaning - more beloved to Him, than being asked for Al-`Āfiyah.” And the Messenger of Allah (ﷺ) said: “The supplication benefits against that which strikes and that which does not strike, so hold fast, O worshippers of Allah, to supplication.”