The Messenger of Allah ﷺ said, "Rejoice and bring glad tidings to the people. Whoever sincerely says, 'There is no god but Allah,' will enter Paradise."So they went out to share the good news with the people. Umar, may Allah be pleased with him, met them and they told him the news, but he sent them back.The Messenger of Allah ﷺ asked, "Who turned you back?"They replied, "Umar."He said, "Umar, why did you turn them back?"Umar answered, "Messenger of Allah, then the people will rely on it alone."
حدثنا بهز حدثنا حماد يعني ابن سلمة حدثنا أبو عمران الجوني
أن رسول الله ﷺ قال أبشروا وبشروا الناس من قال لا إله إلا الله صادقا بها دخل الجنة فخرجوا يبشرون الناس فلقيهم عمر رضي الله تعالى عنه فبشروه فردهم فقال رسول الله ﷺ من ردكم قالوا عمر قال لم رددتهم يا عمر قال إذن يتكل الناس يا رسول الله
Its chain of transmission is sahih, mentioned previously at 19486.