Ata' (may Allah have mercy on him) said: The hand of the grave robber is to be cut. We have also narrated this from Sa'id bin al-Musayyib (may Allah have mercy on him).
Imam al-Bukhari (may Allah have mercy on him) said in al-Tarikh: Hushaym said: Suhayl narrated to us; he said: I was present with Ibn al-Zubayr (may Allah be pleased with them both) when he cut the hand of a grave robber.
Imam al-Bukhari (may Allah have mercy on him) said: Abbad bin al-Awwam said: We used to accuse Suhayl bin Dhakwan Abu al-Sindi al-Makki of lying.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السرقة / 17243