Since you CANNOT show me, ANYWHERE, in the LDS organization's output, where you people are COMMANDED by GOD to do these things, it remains a FACT then, that you are following traditions of men.
Oh, you wanted to know who told us to go to the temple?
If that has been your thrust all along, you have a very oblique way of asking that question.
In
D&C 138:1-60 Joseph F smith had the mission of Jesus to the Spirits in spirit prison shown to him. This mission happened during the three days Jesus was in the tomb, and was why he told the thief "Today shalt thou be with me in paradise", and Mary that he had not yet ascended to his father.
Joseph smith talked how salvation for the dead should come through baptism for the dead in
D&C 128:5
Here is an article that discusses Temple work The endowment, Garments, etc. It is called
The Doctrine of Temple Work And was published in our Ensign magazine. It being written by a general authority of the church and published in a church publication is doctrine from God.
I could get more, but you can search
LDS.org as easily as I, and I am trying to finish the new Harry potter book before monday.