These "all" were the same people mentioned in chapter 1:14-15 who were waiting for the outpouring of God's power. Mary was mentioned as one of those waiting for the Holy Spirit.
Ang “lahat” na binabanggit dito ay yaon ding mga taong binanggit sa 1: 14-15 na naghihintay ng pagbuhos ng kapangyarihan ng Dios.