Weak
graded by Al-Albani
Mishkat al-Masabih 1449
وَعَن أبي الْحُوَيْرِث أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَتَبَ إِلَى عَمْرِو بْنِ حَزْمٍ وَهُوَ بِنَجْرَانَ عَجِّلِ الْأَضْحَى وَأَخِّرِ الْفِطْرَ وَذَكِّرِ النَّاسَ. رَوَاهُ الشَّافِعِي
Abul Huwairith said that God’s Messenger wrote to ‘Amr b. Hazm when he was in Najran telling him to observe the prayer early on the day of sacrifice and late on the day of the breaking of the fast, and to admonish the people. Shafi'i transmitted it.
Cited in Mishkat al-Masabih (No. 1449).