Musnad Ahmad 30:860

Yazid ibn Harun narrated to us, Shu'bah informed us, from Muhammad ibn Ziyad, from Abu Hurayrah, who said: "I truly hope that if life is prolonged for me, I will reach 'Isa ibn Maryam. But if death hastens for me, then whoever among you reaches him, let him convey my greeting of peace to him."