Yes, including "le" or "les" is both common and normal.
When both are present the usual analysis is that "le/les" is the indirect object, and "a mi amigo(s)" or "a usted(es)" merely clarifies to whom "le/les" refers.
This is almost automatic when the indirect object is part of the context of the conversation, particularly when there are other potential third-person indirect objects within the context.
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