Asking a friend for a guy's number?

Anonymous
So I met a guy a while back who is a mutual friend. When we first met, our mutual friend (lets say Bob) kind of made a joke and said we should go on a date. At the time, I wasn't in dating mode so I kind of laughed it off. Now, after spending more time with this guy, I've grown to like him and would like to get to know him better.

Unfortunately, I'm way too shy and awkward to ask for him number- and he hasn't asked for mine either. I feel like to move this forward, I should have a means of communication with him.

Would it be weird if I asked Bob for this guy's number? Especially cause I kind of turned down the opportunity earlier on? I can't think of a reason (excuse) to get Bob to give me his number though!
Asking a friend for a guy's number?
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