"What is Al-Kawthar?" He said: "That is a river that Allah has given me"- that is, in Paradise- 'whiter than milk and sweeter than honey. In it are birds whose necks are like the necks of camels." 'Umar said: "Indeed this is plump and luxurious then." So the Messenger of Allah ﷺ said, "Those who consume it are more plumb than it."  

سُئِلَ رَسُولُ اللَّهِ ﷺ مَا الْكَوْثَرُ قَالَ ذَاكَ نَهْرٌ أَعْطَانِيهِ اللَّهُ يَعْنِي فِي الْجَنَّةِ أَشَدُّ بَيَاضًا مِنَ اللَّبَنِ وَأَحْلَى مِنَ الْعَسَلِ فِيهَا طَيْرٌ أَعْنَاقُهَا كَأَعْنَاقِ الْجُزُرِ قَالَ عُمَرُ إِنَّ هَذِهِ لَنَاعِمَةٌ قَالَ رَسُولُ اللَّهِ ﷺ أَكَلَتُهَا أَنْعَمُ مِنْهَا