Convert Binary to Text
dc, 4 bytes

Needs as input the binary blocks with no separator. This is allowed by the OP.

2i?P


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Explanation: using the "abc" example as test case


2i? sets 2 as input radix, then reads the line (output radix is 10 by default). This converts the binary input to decimal: 011000010110001001100011 -> 6382179.
P is a special printing mode that assumes a base 256 number, using its "digits" as ASCII codes: 6382179 = (97 * 256 2) + (98 * 256 1) + (99 * 256 0) -> abc