Pray that the saints would experience the filling of the Spirit outwardly for their spiritual work to have power (Acts 1:8 and note 82; Luke 24:49 and note 493; Acts 2:1, 4; 4:31; Hymns, #271, s. 2).
Acts 1:8—But you shall receive power when the Holy Spirit comes upon you, and you shall be My witnesses both in Jerusalem and in all Judea and Samaria and unto the uttermost part of the earth.
Luke 24:49—And behold, I send forth the promise of My Father upon you; but as for you, stay in the city until you put on power from on high.
Acts 2:1, 4—And as the day of Pentecost was being fulfilled, they were all together in the same place…And they were all filled with the Holy Spirit and began to speak in different tongues, even as the Spirit gave to them to speak forth.
Acts 4:31—And when they had so besought, the place in which they were gathered was shaken, and they were all filled with the Holy Spirit and began to speak the word of God with boldness.
For further reading please refer to CWWL, 1932-1949, vol. 3, “Crucial Truths in the Holy Scriptures, volume 1,” ch. 27, pp. 489-490.