Q- I would like to ask if the following is from an authentic Hadith: “Allah Ta’ala makes Jannat obligatory upon one who makes the salam twenty times a day.”ദിവസം ഇരുപത് പ്രാവശ്യം സലാം ചൊല്ലുന്നവന്റെ മേൽ അല്ലാഹു തഅല ജന്നത്ത് നിർബന്ധമാക്കുന്നു.?
Imam Tabarani (rahimahullah) has recorded this Hadith on the authority of Sayyiduna ‘Abdullah ibn ‘Umar (radiyallahu’anhuma), with a very weak chain.(Al-Mu’jamul Kabir, Hadith: 14116 and Majma’uz zawwaid, vol.8 pg.30)
However, there are other authentic Hadiths that promise Jannah for those who spread the salam, like the one in Sahih Muslim, Hadith: 192.
‘You will not enter Jannah until you have [complete] Iman, and you will not have [complete] Iman until you have mutual love. Let me show you such an action, if you carry out, you will attain mutual love; spread the salam amongst you.’
And Allah Ta’ala Knows best,
https://hadithanswers.com/reward-for-greeting-twenty-people-a-day/