Canto 3 -
Araṇya-kāṇḍa
Chapter 56: Sītā is Taken to Aśoka-vana
Text 3.57.2

राजा दशरथो नाम धर्मसेतुरिवाचलः।
सत्यसन्धः परिज्ञातो यस्य पुत्रः स राघवः॥

rājā daśaratho nāma dharma-setur ivācalaḥ
satya-sandhaḥ parijñāto yasya putraḥ sa rāghavaḥ

rājā = [there was] a king; daśarathaḥ = Daśaratha; nāma = named; dharma-setuḥ = a dam protecting dharma; iva = who was like; acalaḥ = he was firm; satya-sandhaḥ = fixed in truthfulness; parijñātaḥ = and well known; yasya = is his; putraḥ = son; saḥ rāghavaḥ = Rāghava.

[There was] a king named Daśaratha who was like a dam protecting dharma. He was firm, fixed in truthfulness and well known. Rāghava is his son.

She implies, “How can [I], a lady who has attained such a lineage, transgress [Vedic dharma]?”