Abu Hurairah (May Allah be pleased with him) reported: We were sitting with Messenger of Allah ﷺ. Abu Bakr and 'Umar (May Allah be pleased with them) were also there among the audience. In the meanwhile Messenger of Allah ﷺ got up and left us. We waited long for his return: When we were worried about his safety, and got scared, we got up. I, therefore, went out to look for Messenger of Allah and came to a garden which belonged to the Ansar. He ﷺ said to me "Go and give glad tidings of Jannah to anyone who testifies 'La ilaha illallah (There is no true god except Allah),' being whole-heartedly certain of it" Muslim.