But some of them became obstinate; they refused to believe and publicly maligned the Way. So Paul left them. He took the disciples with him and had discussions daily in the lecture hall of Tyrannus.
NIV
But when some became more and more stubborn (hardened and unbelieving), discrediting and reviling and speaking evil of the Way [of the Lord] before the congregation, he separated himself from them, taking the disciples with him, and went on holding daily discussions in the lecture room of Tyrannus from about ten o'clock till three.
AMP
But when divers were hardened, and believed not, but spake evil of that way before the multitude, he departed from them, and separated the disciples, disputing daily in the school of one Tyrannus.
KJV