Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said, regarding the saying of Allah Almighty, "Then he began to stroke their legs and necks": "He cut off their (the horses') necks and legs."
No one narrated this hadith from Qatadah (may Allah have mercy on him) except Sa'id bin Bashir (may Allah have mercy on him).