Valmiki Ramayana Ayodhya Kanda Sarga 117 Shloka 24

वैदेहि Sita, अहम् I, सर्वत्र all over, विमृशन्ती reflecting, कृतम् performed, अव्ययम् imperishable, योग्यम् befitting, तपः इव like austerities, अतः more than husband, विशिष्टम् better, बान्धवम् relation, न पश्यामि I do not see.

O Sita, on reflection I know of none who is a better friend than the husband. He, like an imperishable penance, once acquired is never lost.