Imam al-Shafi'i (may Allah have mercy on him) said: "The Messenger of Allah (peace and blessings be upon him) ordered that Ma'iz (may Allah be pleased with him) be stoned, and he himself was not present there; and he (peace and blessings be upon him) ordered Sayyiduna Unays (may Allah be pleased with him) to go to a woman, and if she confessed (to adultery), to stone her; and he (peace and blessings be upon him) did not say, 'Inform me so that I may be present (at the time of her stoning).'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / Q16957