17. On the fiftieth day from his resurrection, under what circumstances was Jesus’ promise to his disciples fulfilled?

¹⁷ Jesus Christ ascends to heaven. Ten days pass. The fiftieth day from his resurrection arrives! At Jerusalem the Jewish festival day of Weeks or Pentecost (meaning “Fiftieth” as applying to a day) proceeds. Early in the morning about one hundred and twenty disciples are met together, not at the festive temple, but in an upper chamber, waiting.

Acts 2:1