Valmiki Ramayana Bala Kanda Sarga 31 Shloka 1

अथ then, कृतार्थौ having fulfilled their purpose, मुदितौ rejoicing, वीरौ two heroes, रामलक्ष्मणौ Rama and Lakshmana, तां रजनीम् that night, प्रहृष्टेन with delighted, अन्तरात्मना hearts, तत्र there, ऊषतु: lived.

There, with their purpose fulfilled the heroes, Rama and Lakshmana, full of joy in their hearts spent the night. Viswamitra accompanied by the two princes departs for Mithila they halt on the bank of Sona on their way