Before his ascension, where did Jesus tell the apostles to wait for the gift the Father promised?

Answer: Jerusalem

Jesus commanded them, 'Do not leave Jerusalem, but wait for the gift the Father promised' - baptism with the Holy Spirit.

“And while they were gathered together, He commanded them: “Do not leave Jerusalem, but wait for the gift the Father promised, which you have heard Me discuss. For John baptized with water, but in a few days you will be baptized with the Holy Spirit.””— Acts 1:4-5 (BSB)