It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that a Muslim man granted protection to someone. The commander of that army was Sayyiduna Abu Ubaidah ibn al-Jarrah (may Allah be pleased with him). Sayyiduna Khalid ibn al-Walid and Sayyiduna Amr ibn al-As (may Allah be pleased with them both) said: We will not grant him protection. But Sayyiduna Abu Ubaidah (may Allah be pleased with him) said: We will grant him protection, because I heard the Messenger of Allah (peace and blessings be upon him) say: Any one Muslim can grant protection on behalf of all Muslims.