When the Prophet of Allah ﷺ was lifted to the heavens (for travelling) in Paradise, or as he said, a river whose banks were of transparent or hollowed pearls was presented to him. The angel who was with him struck it with his hand and took out musk. Muhammad ﷺ then asked the angel who was with him: What is this? He replied: It is al-Kawthar which Allah has given you.

لَمَّا عُرِجَ بِنَبِيِّ اللَّهِ ﷺ فِي الْجَنَّةِ أَوْ كَمَا قَالَ عُرِضَ لَهُ نَهْرٌ حَافَتَاهُ الْيَاقُوتُ الْمُجَيَّبُ أَوْ قَالَ الْمُجَوَّفُ فَضَرَبَ الْمَلَكُ الَّذِي مَعَهُ يَدَهُ فَاسْتَخْرَجَ مِسْكًا فَقَالَ مُحَمَّدٌ ﷺ لِلْمَلَكِ الَّذِي مَعَهُ مَا هَذَا قَالَ هَذَا الْكَوْثَرُ الَّذِي أَعْطَاكَ اللَّهُ ﷻ

“While I was traveling through Paradise, a river appeared before me whose banks had tents of pearl. I said to the angel: ‘What is this?’ He said: ‘This is Al-Kauthar, which Allah has granted you.’” He said: “Then he put his hand in the clay, and removed musk from it, then I was raised up to Sidrat Al-Muntaha so I saw a magnificent light at it.”

قَالَ رَسُولُ اللَّهِ ﷺ بَيْنَا أَنَا أَسِيرُ فِي الْجَنَّةِ إِذْ عَرَضَ لِي نَهْرٌ حَافَّتَاهُ قِبَابُ اللُّؤْلُؤِ قُلْتُ لِلْمَلَكِ مَا هَذَا قَالَ هَذَا الْكَوْثَرُ الَّذِي أَعْطَاكَهُ اللَّهُ قَالَ ثُمَّ ضَرَبَ بِيَدِهِ إِلَى طِينَةٍ فَاسْتَخْرَجَ مِسْكًا ثُمَّ رُفِعَتْ لِي سِدْرَةُ الْمُنْتَهَى فَرَأَيْتُ عِنْدَهَا نُورًا عَظِيمًا