Revelation through Joseph Smith to Oliver Cowdery
Harmony, Pennsylvania, April 1829.
Jesus gives Oliver Cowdery the gift of translation (again)
Oliver Cowdery, verily, verily, I say unto you, that assuredly as the Lord liveth, who is your God and your Redeemer,
even so surely shall you receive a knowledge of whatsoever things you shall ask in faith, with an honest heart, believing
that you shall receive a knowledge concerning the engravings of old records, which are ancient, which contain those parts
of my scripture of which has been spoken by the manifestation of my Spirit.
Oliver Cowdery, you'll receive knowledge whatever you ask for, including knowledge about the engravings. 
Yea, behold, I will tell you in your mind and in your heart, by the Holy Ghost, which shall come upon you and which shall dwell
in your heart.
I will put things in your mind and heart, by the Holy Ghost.
Now, behold, this is the spirit of revelation; behold, this is the spirit by which Moses brought the children of Israel
through the Red Sea on dry ground.
Therefore this is thy gift; apply unto it, and blessed art thou, for it shall deliver you out of the hands of your enemies,
when, if it were not so, they would slay you and bring your soul to destruction.
Oh, remember these words, and keep my commandments. Remember, this is your gift.
This is the spirit of revelation.
Now this is not all thy gift; for you have another gift, which is the gift of Aaron; behold, it has told you many things;
Behold, there is no other power, save the power of God, that can cause this gift of Aaron to be with you.
Therefore, doubt not, for it is the gift of God; and you shall hold it in your hands, and do marvelous works; and no
power shall be able to take it away out of your hands, for it is the work of God.
You have another gift - the gift of Aaron. 
And, therefore, whatsoever you shall ask me to tell you by that means, that will I grant unto you, and you shall have
knowledge concerning it.
Remember that without faith you can do nothing; therefore ask in faith. Trifle not with these things; do not ask for that
which you ought not.
Whatever you ask me to tell you, I'll tell you.
Ask that you may know the mysteries of God, and that you may translate and receive knowledge from all those
which have been hid up, that are sacred; and according to your faith shall it be done unto you.
You'll be able to translate the ancient records.
Behold, it is I that have spoken it; and I am the same that spake unto you from the beginning. Amen.
- You shall receive a knowledge concerning the engravings. (v.1)
The "engravings" are, of course, the golden plates that he and Joseph Smaith are translating, and that
will become the Book of Mormon.
- The gift of Aaron (v.6)
In the biblical story, Moses wasn't a good speaker (he had "uncircumscibed lips),
so God suggested that his brother, Aaron, could speak for him. Aaron was also the magician in the family,
turning rods to snakes, rivers to blood, etc. Presumably,
that's what Jesus has in mind here for Oliver Cowdery.