Qays bin Abi Hazim said: I was told that the Prophet (peace and blessings be upon him) said: "Do not speak ill of Khalid, for he is one of the swords of Allah, which Allah Almighty has unsheathed against the disbelievers."
Imam Abu Ya'la recorded this report; he did not name the Companion, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15879