They did in this case as Jesus told them there were some who did not believe in Him. It is not the first time, and not the last time, that people have heard the simple message of the gospel regarding faith in Christ and have walked away.
59 These things He said in the synagogue as He taught in Capernaum.
60Therefore many of His disciples, when they heard this said, “This is a difficult statement; who can listen to it?” 61But Jesus, conscious that His disciples grumbled at this, said to them, “Does this cause you to stumble? 62“What then if you see the Son of Man ascending to where He was before? 63“It is the Spirit who gives life; the flesh profits nothing; the words that I have spoken to you are spirit and are life. 64“But there are some of you who do not believe.” For Jesus knew from the beginning who they were who did not believe, and who it was that would betray Him. 65And He was saying, “For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.” 66As a result of this many of His disciples withdrew and were not walking with Him anymore.
“It is not the first time, and not the last time, that people have heard the simple message of the gospel regarding faith in Christ and have walked away.”
Name one time in the bible this happened other than John 6:66. I am looking for times that disciples, those who were following Jesus, left Jesus based on one of His teachings.