﴿ فَأَنشَأْنَا لَكُم بِهِۦ جَنَّٰتٍۢ مِّن نَّخِيلٍۢ وَأَعْنَٰبٍۢ لَّكُمْ فِيهَا فَوَٰكِهُ كَثِيرَةٌۭ وَمِنْهَا تَأْكُلُونَ ﴾

“And by means of this [water] We bring forth for you gardens of date-palms and vines, wherein you have fruit abundant and whereof you eat,”

The Qur'an then goes on to say that it is from an assured and regular supply of water only that Allah created fruit gardens which produce dates and grapes and many other kinds of fruits. People eat these fruit for their taste and flavour and also preserve some of them for future use as articles of food as is evident from the sentence وَمِنْهَا تَأْكُلُونَ (And of them you eat -, 23:19). Then special mention is made of olives and the oil extracted from it because it has many uses and offers many benefits. And since the Mount Sinai produces an abundant crop of olives therefore a reference has been made to it