It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) announced (the martyrdom of) Sayyiduna Zayd and his two companions before the news had reached him, while his (peace and blessings be upon him) eyes were shedding tears.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1447