Sultan Bahu was a Sufi of the Qadri order from Shorkot in Jhang district. He wrote in Persian and Punjabi, and his Punjabi work is the Abyat, a body of short verses in a strict form where each line ends with the sound hu.
That single sound at the end of every line makes the verses instantly recognisable when sung, and the qawwali and folk settings of them are among the most performed Sufi music in Pakistani Punjab.
His subject is the difference between learning and knowing. He was contemptuous of scholarship without experience and said so repeatedly.
His shrine at Garh Maharaja in Jhang district was moved once because the Chenab changed course and threatened it. The urs draws very large numbers.
He is much less read in Indian Punjab than Bulleh Shah or Shah Hussain, largely because his corpus stayed in Shahmukhi and was not transliterated into Gurmukhi as early or as completely.
His abyat are written so that almost every verse ends on the syllable Hu, and that repetition is what makes them singable and is why they survived orally.
He wrote a large body of prose in Persian. The Punjabi verse is the part that survived in the mouth of the country rather than in libraries.
He is credited with more than a hundred works in Persian on Sufi doctrine and practice, and almost none of that body has been translated into any modern language.