Narrated Jabir bin 'Abdullah: that the Messenger of Allah ( صلی اللہ علیہ وسلم ) said: "The Salam is before talking." With this chain it has been reported that the Prophet ( صلی اللہ علیہ وسلم ) said: "Do not invite anyone to the food until the Salam is given."

And with this chain, it is also narrated from the Prophet ( صلی اللہ علیہ وسلم ) that he said: "Do not invite anyone to food until he greets (with Salam)." __REF_N__ Imam Tirmidhi says:
1- This hadith is Munkar. We do not know this hadith except through this chain.
2- I heard Muhammad bin Isma'il Bukhari say that Anbasah bin Abdur Rahman is weak and confused in narrating hadith, and Muhammad bin Zadhan is Munkar al-Hadith.