Silsilah as-Sahihah 1941 — Etiquette of applying kohl

It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "When a person applies kohl, he should apply it an odd number of times, and when a person performs istinja with stones, he should also use an odd number (of stones) for istinja."