The usurpation of an orphan’s property is a Greater sin, as is clear from the following verse: (As for) those who swallow the property of the orphans unjustly, surely they only swallow fire into their bellies and they shall enter burning fire.’ (Surah an-Nisā’ 4:10) SOURCE: GREATER SINS V1 | AYATOLLAH DASTAGHAIB SHIRAZI (R)