It is narrated from Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him); he said: We were with the Messenger of Allah (peace and blessings be upon him) at Khaybar when a man from Banu Ashja' died, and the Prophet (peace and blessings be upon him) did not offer the funeral prayer over him. The people went to search his belongings and found in them some beads from the beads of the Jews, worth two dirhams.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5156