Water of Euphrates is Prohibited (Haraam) for the Enemy of Ameer al-Momineen (peace be on him)

عَنْ إِبْرَاهِيمَ بْنِ زِيَادٍ قَالَ سَمِعْتُ أَبَا عَبْدِ اللهِ عَلَيْهِ السَّلَامُ يَقُولُ لَوْ أَنَّ عَدُوَّ عَلِيٍّ جَاءَ إِلَى الْفُرَاتِ وَ هُوَ يُزَخُّ زَخِيخاً قَدْ أَشْرَفَ مَاؤُهُ عَلَى جَنْبَتَيْهِ فَتَنَاوَلَ مِنْهُ شَرْبَةً وَ قَالَ بِسْمِ اللهِ وَ إِذَا شَرِبَهَا قَالَ الْحَمْدُ لِلهِ مَا كَانَ ذَلِكَ إِلَّا مَيْتَةً أَوْ دَماً مَسْفُوحاً أَوْ لَحْمَ خِنزِيرٍ

Ibraheem Ibn Ziyaad reports, “I heard Imam Abu Abdillah [al-Sadeq – peace be on him] say, ‘If the enemy comes to the Euphrates while it is in a tumultuous state and overflowing, before drinking it he says, ‘In the Name of Allah’, and after drinking, says ‘All Praise is for Allah’, yet this will not be for him except a dead animal, blood spilled out or the flesh of swine’.”

Note

References:

1. Al-Amaali of al-Shaikh al-Saduq (r.a.), p. 657, H. 8, 94th Majlis
2. Behaar al-Anwaar, vol. 27, p. 218, H. 3