Valmiki Ramayana Ayodhya Kanda Sarga 40 Shloka 24

धर्मे in duty, रता attached, छायेव like shadow, अनुगता following, वैदेहि Sita, अर्कप्रभा sunlight, मेरुम् यथा like mount Meru, पतिम् her husband, न जहाति does not leave, कृतकृत्या हि accomplished her purpose.

Sita, deeply attached to her duty, and with her desire fulfilled is following her husband like a shadow just as the sunlight which never leaves mount Meru.