It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "The first to shoot an arrow in the path of Allah was Sayyiduna Sa'd (may Allah be pleased with him)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Asim except Abu Bakr bin Ayyash, and al-Ala' bin Amr is alone in narrating it from him."
Hadith Referenceالمعجم الأوسط / باب الميم / 5612
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 10241»