أَوْ يَأْخُذَهُمْ فِى تَقَلُّبِهِمْ فَمَا هُم بِمُعْجِزِينَ
Commentary:
The verse means to say that the frequent journeying of disbelievers and their free and unrestricted movements in the land should not lead them to think that their might is invincible and that their glory will never depart. These very movements of theirs will result in the destruction of their political power. In fact, the Battle of Badr was the result of the Meccans having sent out an armed force to provide escort for the trade caravan which was returning from Syria and which was likely to have a clash with Muslims. The battle proved to be the beginning of destruction of the power of the Quraish of Mecca.
The frequent journeying of disbelievers and their free and unrestricted movements in the land should not lead believers to think that their might is invincible and that their glory will never depart. Soon these movements will result in the destruction of their political power.