Recourse to prevailing custom likewise underlies His words in Sūrat al-Nisāʾ: “And live with them honourably” (4:19), and in Sūrat al-Baqarah: “For them, just as against them, are rights recognised as fair” (2:228). With respect to cohabitation and the mutual rights each spouse owes the other, Allah therefore refers husband and wife to what is acknowledged as proper among the people of your region, your land, and your particular circumstances. The variations here are vast—far beyond reckoning—yet all of them are subsumed under these concise revelations, which stand as signs of the Qur’an’s miraculous precision and proof of its truthfulness.
He also says in Sūrat al-Aʿrāf: “Eat and drink, but do not be excessive” (7:31), and: “O children of Adam, We have sent down to you clothing to cover your nakedness and as adornment” (7:26). He has permitted His servants food, drink, and attire, without tying them to any specific kind, fully aware that these matters differ according to time, place, and circumstance. Thus His command applies to whatever food, drink, or garment exists at any given moment; it is not confined to what was available at the time the Qur’an was revealed.
The same principle appears in Sūrat al-Anfāl: “Prepare against them whatever force you can muster” (8:60). Plainly, the weapons and means of power known when the Qur’an came down are not the same as those that emerged later. The verse therefore covers every attainable form of strength in every age, in a manner suited to that era.
Likewise, when He says in Sūrat al-Nisāʾ: “except when it is trade conducted by mutual consent among you” (4:29), He neither limits us to a particular type or category of commerce nor fixes the wording by which consent is expressed. This shows that Allah has permitted every kind of transaction not expressly prohibited by the Lawgiver, and that any speech or action that truly establishes mutual satisfaction is sufficient to conclude a sale or a gift. Whatever achieves genuine consent—whether through words or deeds—validly effects exchanges and voluntary transfers of ownership.
The Qur’an contains many other passages of this nature.