The Messenger of Allah ﷺ said, "The coolness of my eyes has been placed in prayer."
قال رسول الله ﷺ: جعلت قرة عيني في الصلاة.
No references are available.
Tabarani reported it in Al-Kabir (20/420) from Hafs bin Umar Raqqi and Muhammad bin Hasan bin Kaysan Masissi, who both said, Abu Huzaifa told us, Sufyan told us, from Ziyad bin Alaqa, from Mughira bin Shuba, who said, then he mentioned it.Its isnad is hasan because of Abu Huzaifa, who is Musa bin Masud Nahdi. He is disputed, but his hadith is hasan when he does not err, and this is one of those cases, for it has a basis that confirms he got it right.