It is quoted in ‘Basaerud Darajat’, “Ma’alimul Zulfa”, and the third volume of ‘Biharul Anwaar’ that Abdullah ibne Sinan asked Imam Ja’far-as-Sadiq (a.s.) regarding the Spring of Kausar. Imam (a.s.) replied that its width is approximately equal to the distance from Basra in Iraq to Sanaa in Yemen. Abdullah seemed astonished. Then Imam Sadiq (a.s.) asked him,
“Do you wish to have a glimpse of it?”
He replied, “Yes O, son of the Prophet!” Imam (a.s.) escorted him outside Madina, and struck his foot on the ground. Abdullah says that by the Imam’s order the veils of the unseen were lifted off my eyes. I saw a stream flowing beneath, and the place where we were standing was surrounded by it. I saw that on one side of the stream was flowing water which was whiter than ice, and on the other side milk, and in between was flowing the “Pure Drink” (Sharabe Tahoora) coloured red like rubies (Yaqoot). I have never witnessed such a beautiful view before, nor wine (the wine referred to here is not the usual intoxicating liquid, rather it is a pure drink reserved for the believers in Paradise) flowing between water and milk.
Imam (a.s.) said, “As is written in the Qur’an, that in Paradise flows rivers of milk, water and wine, verily this stream flows from it. There are beautiful trees on both sides of this river, and between the trees the ‘houries’ of Paradise are standing with their beautiful hair flowing in the air, the likeness of which cannot be seen in this world.”
Then the Imam (a.s.) went towards one of the ‘houries’ and asked for a drink. The ‘houri’ saluted Imam (a.s.) and filled the cup with water from the stream and presented it to Him. Imam (a.s.) gave the cup to me to drink. I drank and was surprised for I had never tasted such a delicious and tasty water in my life, nor ever smelt such fragrance of musk.
I said, “May my life be your ransom, the likeness of what I saw today can never be imagined in my life.” Imam Sadiq (a.s.) replied,“Whatever you have seen is quite less when compared to the blessings reserved for our Shi’ahs. When anyone among them dies, their spirits stroll in these gardens, and drink and bathe in these streams, and thus gain pleasure by consuming the delicious fruits.”