Acts 18:21

I must - keep this feast - Most likely the passover, at which he wished to attend for the purpose of seeing many of his friends, and having the most favorable opportunity to preach the Gospel to thousands who would attend at Jerusalem on that occasion. The whole of this clause, I must by all means keep this feast that cometh in Jerusalem, is wanting in ABE, six others; with the Coptic, Ethiopic, Armenian, and Vulgate. Griesbach leaves it in the text, with the mark of doubtfulness; and Professor White, in his Crisews, says, probabiliter delenda. Without this clause the verse will read thus: But he bade them farewell, saying, I will return again unto you, if God will. And this he did before the expiration of that same year, Acts 19:1, and spent three years with them, Acts 20:31, extending and establishing the Church at that place.

Keep this feast - Probably the Passover is here referred to. Why he was so anxious to celebrate that feast at Jerusalem, the historian has not informed us. It is probable, however, that he wished to meet as many of his countrymen as possible, and to remove, if practicable, the prejudices which had everywhere been raised against him, Acts 21:20-21. Perhaps, also, he supposed that there would be many Christian converts present, whom he might meet also.

But I will return ... - This he did Acts 19:1, and remained there three years, Acts 20:31.

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 .