Whom did jesus send to comfort and give power to the disciples after the ascension?

After the ascension of Jesus, he sent the Holy Spirit to comfort and empower the disciples. The Holy Spirit is often referred to as the Advocate or Comforter in Christian theology. This event is described in the New Testament book of Acts, specifically in Acts 2, where the Holy Spirit descends upon the disciples on the day of Pentecost, empowering them to spread the message of Jesus.