TABARANI 15392:
from ʿImrān b. Ḥuṣayn —
[Machine] Narrated by the Prophet ﷺ that he said to a man, "Did you fast from the beginning of this month, meaning Sha'ban?" The man replied, "No." The Prophet then said, "If you have completed Ramadan, then fast for a day or two."
الطبراني ١٥٣٩٢:
عن عمران بن حصين —
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لِرَجُلٍ «هَلْ صُمْتَ مِنْ سُرَرِ هَذَا الشَّهْرِ يَعْنِي شَعْبَانَ ؟» قَالَ لَا قَالَ «فَإِذَا أَفْطَرْتَ رَمَضَانَ فَصُمْ يَوْمًا أَوْ يَوْمَيْنِ»