It is narrated with the same chain that the Negus (al-Najashi) sent three short spears to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) kept one for himself, gave one to Sayyiduna Ali (may Allah be pleased with him) and gave one to Sayyiduna Umar (may Allah be pleased with him). Sayyiduna Bilal (may Allah be pleased with him) used to carry it walking ahead of him (peace and blessings be upon him) and, on the occasion of the two Eids, plant it in front of him (peace and blessings be upon him), and he (peace and blessings be upon him) would pray facing it.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5435