John Wesley on Acts 18:21

I must by all means keep the feast at Jerusalem - This was not from any apprehension that he was obliged in conscience to keep the Jewish feasts; but to take the opportunity of meeting a great number of his countrymen to whom he might preach Christ, or whom he might farther instruct, or free from the prejudices they had imbibed against him. But I will return to you - So he did, Acts 19:1.