‏الصلاة : Hadeeth No:1287 Abu Huraira reported that the Messenger of Allaah (sallAllaahu alayhi wa sallam) said: This heat is from the exhalation of Hell-fire, so delay the prayer till it is cool....

‏الذكر والدعاء والتوبة والاستغفار‏ : Hadeeth No:6522 Al-Agharr al-Muzani, who was one amongst the Companions (of the Prophet) reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) said: There is (at times) some sort of shade upon my heart, and I seek forgiveness from Allaah a hundred times a day....