Canto 3 -
Araṇya-kāṇḍa
Chapter 56: Sītā is Taken to Aśoka-vana
Text 3.57.22
न तु शक्ष्याम्युपक्रोशं पृथिव्यां दातुमात्मनः॥
na tu śakṣyāmy upakrośam pṛthivyām dātum ātmanaḥ
na tu śakṣyāmi = but I cannot; upakrośam = disgrace; pṛthivyām = on earth; dātum = bring; ātmanaḥ = upon myself.
But I cannot bring disgrace upon myself on earth.