Well, Glirdan there may be more, but there is this, and it should be sufficient to back ya up

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Quote:
"Good Gimli!" said Gandalf. "You encourage me. We will seek the hidden doors together. And we will come through. In the ruins of the Dwarves, a dwarf's head will be less easy to bewuilder than Elves or Men or Hobbits. Yet it will not be the first time that I have been to Moria. I sought there long for Thrain son of Thror after he was lost. I passed through, and I came out again alive!"~A Journey in the Dark
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And if I remember right Gandalf had gone searching for Thrain because he had one of the Dwarven Rings.