Valmiki Ramayana Ayodhya Kanda Sarga 12 Shloka 59
Original Shlokaविरमैतेन भावेन त्वमेतेनानृतेन वा।।2.12.59।। यदि भर्तुः प्रियं कार्यं लोकस्य भरतस्य च।
1 source checked for this shloka
भर्तुः of your husband, लोकस्य of this world, भरतस्य च of Bharata also, प्रियम् beneficence, कार्यं यदि if you wish to do, एतेन भावेन with this thought (that Bharata should become king), अनृतेन with falsehood, एतेन वा or with such thought of exiling Rama, त्वम् you, विरम refrain.
If you wish to do good to your husband, to the world and also to Bharata, refrain from this illusory thought.