The actor was in Amritsar with his sister Shweta Nanda. They visited three prominent gurdwaras.
"Abhishek did some kar seva by cleaning up the premise, and washing the dishes at the 'langar' (in the Golden Temple). There were two other prominent gurdwaras that they visited," Amitabh posted on his blog bigb.bigadda.com Thursday.
The 67-year-old, whose mother Teji Bachhcan belonged to a Sikh family, is happy to see the religious side of his children.
"It is always such a joy to see children putting their minds to faith and devotion. Nothing would give me greater joy and nothing I believe could be better than their achievement in belief and prayer," he added.
Abhishek, who visited Amritsar for the shooting of his reality show "Bingo", also posted a message on his Twitter page saying: "Went to the Golden Temple at 3 in the morning. Did seva for about an hour, then just sat there listening to the kirtan."