Valmiki Ramayana Ayodhya Kanda Sarga 29 Shloka 21
Original Shlokaययदि मां दुःखितामेवं वनं नेतुं न चेच्छसि। विषमग्निं जलं वाऽहमास्थास्ये मृत्युकारणात्।।2.29.21।।
1 source checked for this shloka
एवम् in this, दुःखिताम् distressed, माम् me, वनम् to the forest, नेतुम् to take, न च इच्छसि यदि if you do not wish, मृत्युकारणात् to seek death, विषम् poison, अग्निम् fire, जलं वा or water, आस्थास्ये I shall take refuge.
If you do not wish to take your wife in this time of distress to the forest I shall die by consuming poison or throwing myself into fire or drowning in water.