I like rebuses, here are four of them.
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An elephant never forgets. (An + reorder "elepath" and 7N (nitrogen) by the numbers next to the letters, + reuse N + ever + for:ts (I hope I'll find the "ge" soon.)
A friend in need is a friend indeed. (interpreting the mixing of letters as one word being inside the other)
All bark and no bite (All + "B arc" with negated "bit + e")
A dime a dozen (should be self-explanatory.)