Once Guru Gobind Rai disguised himself, while playing a trick to help his Sikhs learn about what selfless service truly means. He disguises himself as an regular traveler. It was very early in the morning before the sunrise and he would knock on everybody's door and ask, "excuse me, I don't want to bother you, but do you have any food to share?" Listen to find out if anyone is ready to serve at all times.
Bibi Shanti was a devoted Sikh of Guru Hargobind ji. She taught her son, Pulla, that if he believed strongly, then surely the Guru would come and visit them. One glorious day Guru Hargobind and some Sikhs really did come and visit. Their humble prayers were answered. The Guru had them make langar and all the villagers experienced a miracle they wouldn't soon forget.
The great Emperor of India, King Akbar, went to go visit the Guru. Guru Amar Das Dev ji wouldn't see the visiting royalty until his guest had eaten in the Guru's langar. So this great ruler of the whole land sat along side all kinds of common people and ate langar. Emperor Akbar was impressed that the Guru served so many people, and was humbled that Guru Amar Das didn't consider anyone higher or lower.