The actual words are:
"Whoever gives me the good news of Safardeparting, I will ..."
Some people quote it with the words; "Whoever gives me the good news of thecommencement of Rabi'ul Awwal..."
(These are both the same as Rabi'ul Awwal follows Safar, so the departing of Safar actually means the starting of Rabi'ul Awwal)
This narration is classified a fabrication By Imam Saghani (rahimahullah) & Mulla 'Ali Qari (rahimahullah).
'Allamah 'Ajlooni (rahimahullah) concurs with their decision too.
See Kashful Khafa, Hadith:2416
Ref from: - DarulHadith