"Allah's Messenger combined the Zuhr and Asr (prayers), and the Maghrib and Isha (prayers) in Al-Madinah, without being in a state of fear, nor due to rain."
Jami` at-Tirmidhi Book 2, Hadith 39
← Previous Hadith the Prophet said: "Whoever catches a Rak'ah of Subh before the sun has risen, then he has caught Subh. Whoever catches a Rak'ah of Asr before the sun has set, then he has caught Asr."

Jami` at-Tirmidhi Book 2, Hadith 38 Next Hadith → the Prophet said: "Whoever combines two prayers without any excuse then he has committed something from the major sins."

Jami` at-Tirmidhi Book 2, Hadith 40