السلام
كلمة (السلام) في اللغة مصدر من الفعل (سَلِمَ يَسْلَمُ) وهي...
‘Abdullāh ibn ‘Umar, Abu Hurayrah, and Abu Dharr (may Allah be pleased with them) reported that the Prophet (may Allah's peace and blessings be upon him) said: "When the heat is intense, delay the prayer until it becomes fairly cool, for intense heat is from the boiling and breathing of Hellfire."
شرح الحديث :
The Prophet (may Allah's peace and blessings be upon him) ordered that the Zhuhr Prayer should be delayed when the heat is intense, which is from the breathing and blaze of Hellfire, to a time when it is fairly cool, so that one is not distracted by heat and grief from submissiveness in prayer.