Valmiki Ramayana Ayodhya Kanda Sarga 2 Shloka 14

तस्मिन् when such, सुते son (Rama), इमाम् this, महीम् earth, निवेश्य entrusting, अनेन श्रेयसा to ensure the welfare of the world, एवम् thus, सद्य: without any delay, संयोज्य having united, गतक्लेश: relieved of my anxieties, भविष्यामि shall become.

I shall be relieved of my anxiety by entrusting the land (ruled by me) to my son (Rama) without any more delay and thus ensure the continued welfare of this world.