'And inform them' means: inform them with a great informing about a great matter, which is that the water they drink, which is the water of their well, 'that the water is a division between them,' meaning: between Thamud and the she-camel. It is dominated by the understanding of those who possess reason, meaning: when we send it forth, there will be for them a day in which it does not share with them in the water, and it has a day in which it does not leave a drop in the well for anyone among them to take. And it will provide all in place of water with milk. And when he informed about the distribution of the water, he made it known that it is in a strange manner by saying as a continuation: 'Every drink,' meaning: from that and a share of it and the source of the pools at the time it is drunk, 'is present,' meaning: it is worthy of what is in it from the amazing matter that the present ones will attend it with a great attendance, and their souls will strive for that because it has become in its abundance and beauty like the water of the present for the desert dwellers, and it has qualified to be opposed by its present ones from its beauty, and they will return to it and many will gather upon it and they will accustom themselves to it.