Bhagat Dhanna Ji was a Jat farmer of Dhuan Kalan in Tonk, Rajasthan. Three of his hymns are in the Guru Granth Sahib Ji.
The story attached to him is that as an illiterate cultivator he was given a stone by a Brahmin and told it was God, and that he set food before it and refused to eat until it ate with him, and that his sincerity was answered. Guru Arjan Dev Ji refers to it directly in his own composition in Asa, naming Dhanna alongside Namdev, Kabir, Ravidas and Sain.
That reference matters because it is a Guru, in scripture, listing the low-caste and non-Brahmin devotees by name as the standard of attainment.
He is one of the very few farmers among the Bhagats, which is not lost on a Punjabi Jat readership.
One of the three hymns lists what a household actually asks for, grain, cloth, a milk animal, a good horse, and then asks for the thing behind all of them. It is unusual in the volume for how domestic it is.
Guru Arjan Dev Ji names him with Namdev Ji, Kabir Ji, Ravidas Ji and Sain Ji in a hymn in Asa, which is the earliest internal evidence of how the Bhagats were regarded by the compilers.
The story of the stone and the offering comes from the later hagiographies and is told to make the point that the intention was accepted where the form was ignorant. It is among the best known stories in Punjabi religious teaching.