Is it true that the title "Lion of Allah" (Asadullah) belongs to our master Hamza (may Allah be pleased with him), and is it true that Abu Bakr said of Khalid ibn al-Walid, "He is the Lion of the Sunnah" (Asad al-Sunnah)?

It has not been reported in the Sunnah that Abu Bakr titled Khalid ibn al-Walid as "Lion of the Sunnah." The correct title for Khalid ibn al-Walid is "The Drawn Sword of Allah," and he was given this title by the Prophet, peace and blessings be upon him. As for the title "Lion of Allah," Abu Qatadah was given this title by Abu Bakr on the day of Hunayn, and prior to that, Hamza ibn Abd al-Muttalib.