Yahya related to me from Malik from Ibn Shihab that he had asked Salim ibn Abdullah, "Can you join dhuhr and asr when travelling?" He said, "Yes, there is no harm in that. Haven't you seen the people pray on Arafa?
Hadith No. 331
Muwatta Malik
Gradings:
Salim al-Hilali:
Maqtu Sahih