A man accused of murdering his wife's lover in an honour killing "completely lost it" when the victim called him a poofter, a Sydney jury has been told.

Hazairin Iskandar was provoked by Mohd Shah Saemin to the point where he lost self control and stabbed him, James Trevallion, representing Iskandar, told the Supreme Court on Monday.

Mr Saemin, known as Shah, died after he was attacked by Iskandar and his son Andrew outside his Leichhardt flat in Sydney's inner west on the night of February 21, 2010.

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