“I once visited abu ‘ Abd Allah (a.s.), and said, ‘I pray to Allah to keep my soul in service for your cause, what do you say about chess?’ He (the Imam) said, ‘One who turns it from side to side is like one who turns pork from side to side.’ I then asked, ‘What must one who has turned pork from side to side do?’ He (the Imam) said, ‘He must wash his hands.’”