Abu Huwaireth reports that the Messenger of Allah ﷺ wrote a letter to Amr bin Hazm (may Allah be pleased with him) when he was at Najran, saying: "Offer the Eid al-Adha prayer early and the Eid al-Fitr prayer with some delay, and also admonish and advise the people."
Hadith Referenceمسند الإمام الشافعي / كتاب العيدين والأضاحي والاستسقاء / 478
Hadith Takhrijاسنادہ ضعیف، لضعف شیخ الشافعی ولإرسالہ ، اخرجه البيهقي: 3/ 282 ۔ وفى المعرفة السنن والآثار له (1878)۔