Reference for Bava Batra 334:4

אין כותבין שטר אריסות וקבלנות אלא מדעת שניהם והמקבל נותן שכר

IS NOT WRITTEN EXCEPT WITH THE APPROVAL OF BOTH PARTIES, AND THE FEE IS PAID BY THE TENANT.<span class="x" onmousemove="('comment',' Lit., 'the receiver', i.e., 'he who undertook the work'. ');">¹⁰</span> DEEDS OF ARBITRATION<span class="x" onmousemove="('comment',' Heb. Shetare berurin, [H] V. Gemara, infra. ');">¹¹</span> AND ALL [OTHER] JUDICIAL DOCUMENTS ARE NOT WRITTEN EXCEPT WITH THE APPROVAL OF BOTH PARTIES, AND BOTH PAY THE FEE.<span class="x" onmousemove="('comment',' For the preparation of the shetare berurin. ');">¹²</span>

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