Al-Kāfi
Hadith 2235عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ أَبِي عَبْدِ اللَّهِ عَنْ أَبِيهِ عَنْ خَلَفِ بْنِ حَمَّادٍ عَمَّنْ رَوَاهُ قَالَ بَعَثَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) ابْنَ أَخِيهِ فِي حَاجَةٍ فَجَاءَ وَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) قَدِ اطَّلَى بِالنُّورَةِ فَقَالَ لَهُ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) اطَّلِ فَقَالَ إِنَّمَا عَهْدِي بِالنُّورَةِ مُنْذُ ثَلَاثٍ فَقَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) إِنَّ النُّورَةَ طَهُورٌ .
4. A number of our people have narrated from Ahmad ibn abu ‘Abd Allah from his father from Khalaf ibn Hammad from those who narrated to him who has said the following: “Abu ‘Abd Allah (a.s.), once sent the son of his brother for something he needed. He returned when abu ‘Abd Allah (a.s.), had applied lime paste. He (the Imam) said, ‘Apply lime paste.’ He said, ‘Only three days ago I had applied it.’ Abu ‘Abd Allah (a.s.), said, ‘Applying lime is purifying.’”