Man Lā Yaḥḍuruh al-Faqīh
Hadith 8314045 - وَ سَأَلَ عَبْدُ اَللَّهِ بْنُ سِنَانٍ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ :
عَنْ شِرَاءِ اَلْفِضَّةِ وَ فِيهَا اَلزِّيبَقُ وَ اَلرَّصَاصُ بِالْوَرِقِ وَ هِيَ إِذَا أُذِيبَتْ نَقَصَتْ مِنْ كُلِّ عَشَرَةٍ دِرْهَمَانِ أَوْ ثَلاَثَةٌ فَقَالَ "لاَ يَصْلُحُ إِلاَّ بِالذَّهَبِ".
Hadith.4045 - Abdullah ibn Sinan asked Abu Abdullah (as) about buying silver that contains mercury and lead with silver coins, knowing that when it is melted, it decreases by two or three dirhams for every ten.
Imam (as) said: "It is not permissible, except with gold."