योगक्षेमौ हि सीताया वर्तेते लक्ष्मणावयोः।।2.53.3।।
Translation
लक्ष्मण O Lakshmana, अद्य प्रभृति from now on, रात्रिषु during the nights, अतन्द्रिभ्याम् sleeplessly, जागर्तव्यम् keep awake, सीतायाः Sita's, योगक्षेमौ acquisition and protection, अवयोः on both of us, वर्ते हि depends.
O Lakshmana, from now on we must be sleeplessly vigilant at night. The welfare and safety of Sita depend on us both.