João 7:39

John helped his readers understand that Jesus was referring to the outpouring of the Holy Spirit that happened after Jesus’ death, resurrection, and ascension, on the day of Pentecost (cf. John 15:26; John 16:7; Acts 1:5; Acts 1:8; Acts 2). That outpouring was something that God had not done before. It was similar to what Joel predicted He would do in the last days (Joel 2:28-32; cf. Acts 2:16-21). "Those who believed in Him" includes subsequent believers as well as believers on the day of Pentecost (cf. 1 Corinthians 12:13). Jesus announced that the Holy Spirit would come on believers in a new way, namely, to baptize, seal, and indwell them. John frequently spoke of Jesus’ death, resurrection, ascension, and exaltation as all part of His glorification (John 11:4; John 12:16; John 12:23; John 13:31; cf. Philippians 2:8-9). [Note: See Harris, p. 194.]