´Abu Hurairah narrated that the Messenger of Allah (ﷺ) said:` “Call upon Allah while being certain of being answered, and know that Allah does not respond to a supplication from the heart of one heedless and occupied by play.”
Hadith ReferenceSunan at-Tirmidhi / Chapters on Supplication / Hadith: 3479
Hadith Gradingالألبانی:حسن، الصحيحة (596) | زبیر علی زئی:(3479) ضعيف, صالح المري: ضعيف (تقدم:2133) وله شاهد ضعيف عند أحمد (177/2)