The Saints Will Be Endowed in the Temple with Power from on High 

Doctrine and Covenants 95:7–9 

7 And for this cause I gave unto you a commandment that you should call your solemn assembly, that your fastings and your mourning might come up into the ears of the Lord of Sabaoth, which is by interpretation, the creator of the first day, the beginning and the end.
8 Yea, verily I say unto you, I gave unto you a commandment that you should build a house, in the which house I design to endow those whom I have chosen with power from on high;
9 For this is the promise of the Father unto you; therefore I command you to tarry, even as mine apostles at Jerusalem.

President Joseph Fielding Smith wrote:

“In the revelation given on Fishing River [D&C 105] the Lord had said the elders must be endowed with power from on high before they would be fully prepared to go forth to build up the Church and ‘prune’ His vineyard.”

(Essentials in Church History [1979], 161.)