Valmiki Ramayana Ayodhya Kanda Sarga 53 Shloka 16
Original Shlokaमा स्म मत्कारणाद्देवी सुमित्रा दुःखमावसेत्। अयोध्यामित एव त्वं काल्ये प्रविश लक्ष्मण।।2.53.16।।
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लक्ष्मण Lakshmana, मत्कारणात् because of me, देवी mother, सुमित्रा Sumitra, दुःखम् in sorrow, मा आवसेत् स्म should not experience, त्वम् you, काल्ये in the morning, इत एव from here, अयोध्याम् to Ayodhya, प्रविश enter.
O Lakshmana, because of me mother Sumitra should not live in sorrow. Therefore, tomorrow morning go back to Ayodhya from here itself.