He said that Singh, who was assassinated by terrorists, sacrificed his life for the unity and integrity of the country.
He called upon the people of Punjab to follow his teachings of unity, amity and communal harmony in which he believed.
Among others, present on the occasion included Singh's grandson Ravneet Bittu, who is also Congress MP from Ludhiana Lok Sabha seat.
Meanwhile, in Jalandhar, Congress leaders also paid tribute to him by garlanding his statue at the BMC Chowk there. Party's Jalandhar MP, Chaudhary Santokh also announced Rs 5 lakh for the refurbishment of the statue.