Application of Collyrium (Kohl)
Ibn Abbas (may Allah be pleased with him) narrated that, the Messenger of Allah (peace and blessings be upon him) said:
"Among the best types of collyrium you use is ithmad (kohl), it clears the vision and makes the hair sprout."1
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([1]) Sunan Al-Nisa'ie – Kitab Al-Zinah (3115), Sunan Abi Dawoud – Kitab Al-Tib (8783), Musnad Al-Imam Ahmed (2048).