Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Do not cut the hand for fruit, nor for anything like it." Yahya (may Allah have mercy on him) said: Al-thamar is the fruit that is on the tops of the date palms, and al-kathar is the palm shoots (al-wadi) and the palm pith (al-jummar).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السرقة / 17202