After the blind man got healed by Jesus and had a conversation with his neighbors, the neighbors brought the blind man to the Pharisees. Turns out that the healing (like in John 5) happened on the Sabbath (9:14) -- AKA a day where the Jewish authorities supervised to make sure no one is working.
Just like in response to the neighbors, the formerly blind man told the Pharisees the way he got healed. However, Pharisees proclaimed that the healer is not of God because the act was done on the Sabbath (9:16)! It's worth noting that technically, such healings are allowed. Thomas Constable noted that the point of Sabbath is for people to not do work as in job (Study Light), and a one-time walk to a pool doesn't seem to be classified as a day-job. Even then, God's intent of the Sabbath is for people to pay attention to God, and Jesus's miracles were designed to reveal God (as seen in past prophecies). Other people pointed out how a sinner shouldn't do such signs (9:16), and we know from John 5 that Jesus's miracles serve as evidence to support his legitimacy.
The people then asked the blind man of his opinion of the healer, and the blind man saw the healer as a prophet (9:17). According to Merriam-Webster, a "prophet" is "one who utters divinely inspired revelations", and considering Jesus's comments in the beginning of John 9 and how the blind man saw what we know as God's work, Jesus does count as a prophet.