D&C 62

 The told several missionaries still on their way to Zion - 

"Nevertheless, ye are blessed, for the testimony which ye have borne is recorded in heaven for the angels to look upon; and they rejoice over you, and your sins are forgiven you."  (Doctrine and Covenants 62:3)

It's an interesting thought that testimonies are recorded in heaven to be read.  Does this include angels that have passed on?