Acts 18:20

When they desired him to tarry longer time with them
Either Aquila and Priscilla, whom he left here, for here they were, as is certain from Ac 18:24,26
or rather the Jews with whom he reasoned, who might be desirous of further conference with him, upon the subject they had disputed about; either in order to gain more knowledge, or in hopes of baffling and confounding him:

he consented not;
for a reason afterwards given.