They will return to ponder their verdict in the case, in which both men have pleaded not guilty to charges of conspiracy to obtain and accept corrupt payments, and conspiracy to cheat at gambling.
Prosecutors alleged that Butt, 27, and Asif, 28, conspired with British agent Mazhar Majeed and bowler Mohammad Amir to deliver three intentional no-balls during the Lord's Test between Pakistan and England in August 2010.
The trial judge, Jeremy Cooke, finished his summing-up of the case on Thursday before sending the 12 member jury out to start their deliberations.
Majeed and Amir are facing the same charges but are not standing trial alongside Butt and Asif.
Butt and Asif were charged after allegations about their involvement in spot-fixing appeared in the now-defunct News of the World tabloid, shortly after the Lord's Test.
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