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الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ السِّنْدِيِّ قَالَ حَدَّثَنِي عِيسَى بْنُ عَبْدِ الرَّحْمَنِ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ دَخَلَ أَبُو عُكَّاشَةَ بْنُ مِحْصَنٍ الْأَسَدِيُّ عَلَى أَبِي جَعْفَرٍ ( عليه السلام ) فَقَدَّمَ إِلَيْهِ عِنَباً وَ قَالَ لَهُ حَبَّةً حَبَّةً يَأْكُلُ الشَّيْخُ الْكَبِيرُ وَ الصَّبِيُّ الصَّغِيرُ وَ ثَلَاثَةً وَ أَرْبَعَةً يَأْكُلُ مَنْ يَظُنُّ أَنَّهُ لَا يَشْبَعُ وَ كُلْهُ حَبَّتَيْنِ حَبَّتَيْنِ فَإِنَّهُ مُسْتَحَبٌّ
Al Husayn Bin Muhammad, from Moala Bin Muhammad, from Ali Bin Al Sandy, from Isa Bin Abdul Rahman, from his father, from his grandfather who said,
Abu Akasha Bin Mihsan Al-Asady came over to Abu Ja’far-asws, so he-asws forwarded some grapes to him and said to him: ‘One, one (at a time) is how the old man and the young children eat, and three or four (at a time) is how he eats, the one who thinks he is not satiated, and you eat two (at a time), for it is ‘مُسْتَحَبٌّ’ (likeable) beneficial’.[1]
NB: https://hubeali.com/the-kiraha-makruh-mustahab-and-sunnah/
[1] Al Kafi – V 6 – The Book of Foodstuffs Ch 99 H 6