Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "Goodness and excellence (or nobility) have been tied to the forelocks of horses until the Day of Resurrection, and their owners are helped in looking after them. So pass your hands over their forelocks, pray for blessing for them, and put collars on them, but do not hang bowstrings on them." A narrator named Ali reported these words: "Do not hang idols on their necks."
Imam Ahmad recorded it, and Imam al-Tabarani recorded it in al-Mu'jam al-Awsat in abridged form. The narrators of Imam Ahmad are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9340