Bangladesh wicketkeeper-batsman Mushfiqur Rahim was let off with a reprimand after being found guilty of showing dissent during the first Test against South Africa.

Rahim was given out leg before for 12 to a delivery from Jacques Kallis during Bangladesh's reply to South Africa's first innings score of 441 for nine declared.

While walking off, Rahim touched the edge of his bat to indicate he had edged the delivery onto his pads.

The 20-year-old was found to have breached Level 1.3 of the ICC Code of Conduct which relates to "showing dissent at an umpire's decision".

Rahim was found guilty at a hearing conducted by match referee Alan Hurst, but was let off with an official reprimand.

"The player has apologised for his actions and said he sincerely regretted this misdemeanour," Hurst said.

"This apology and his previous good record were taken into consideration."