(Quraish) 106 : 2
إِيلَافِهِمْ رِحْلَةَ الشِّتَاءِ وَالصَّيْفِ
For they were reconciled in the winter and summer seasons.
It is Lord Allah who tamed the Quraishees with one another and made favorable conditions for them to travel both in the summer season and in the winter season for business purposes. If they conducted business trips during the summer season to Syria and Palestine, which were cooler places, during the winter season, they conducted business trips to Yemen, which was a tropical place.