Musnad Abu Ya'la al-Mawsili 117:185

Ishaq ibn Abi Isra'il narrated to us, Abd al-Razzaq narrated to us, Ma'mar informed us, from Thabit, from Anas ibn Malik, who said: When the Prophet, may Allah bless him and grant him peace, arrived in Medina, the Abyssinians played with their spears out of joy for that.