Albert Barnes on 1 Corinthians 16:5

Now I will come unto you. I purpose to come unto you. He had expected to see them on his way to Macedonia, but, on some account, had been induced to abandon that design. 2Cor 1:16; 2Cor 1:17.

When I shall pass through Macedonia. When I shall have passed through Macedonia. He proposed to go to Macedonia first, and, having passed through that country, visiting the churches, to go to Corinth. For the situation of Macedonia, Acts 16:9.

For I do pass through Macedonia. I design to do it. It is my present intention. Though he had abandoned, from some cause, the design of passing through Corinth on his way to Macedonia, yet he had not given up the design itself. It was still his intention to go there.

(c) "when I shall" 2Cor 1:15,16 (++) "do pass" "I intend to"