1350. hadíth
وَ ذُكِرَ اَلْمَاءُ عِنْدَ اَلصَّادِقِ عَلَيْهِ اَلسَّلاَمُ فِي طَرِيقِ مَكَّةَ وَ ثِقْلُهُ قَالَ «اَلْمَاءُ لاَ يَثْقُلُ إِلاَّ أَنْ يَنْفَرِدَ بِهِ اَلْجَمَلُ فَلاَ يَكُونَ عَلَيْهِ غَيْرُ اَلْمَاءِ.
It was mentioned to Imam Jafar ibn Muhammad Al-Sadiq (a.s) about water on the road to Mecca and its weight. Imam (a.s) said: "Water is not heavy unless the camel is carrying only water and nothing else."