Man Lā Yaḥḍuruh al-Faqīh
Hadith 1395107 - وَ فِي رِوَايَةِ اَلسَّكُونِيِّ قَالَ قَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ : "لاَ قَطْعَ فِي ثَمَرٍ وَ لاَ كَثَرٍ وَ اَلْكَثَرُ هُوَ اَلْجُمَّارُ".
Hadith.5107 - In the narration of Al-Sakuni, the Messenger of Allah (swt) (peace be upon him and his family) said: "There is no cutting (of the hand) for stealing fruit or kathar."
And kathar refers to the inner core of palm trees (Al-jummar).