Valmiki Ramayana Ayodhya Kanda Sarga 87 Shloka 18

ततः तु thereafter, तदा then, लक्ष्मणोऽपि Lakshmana also, जलशेषेण with the remainder of the water, अकरोत् satisfied his hunger, ते त्रयः those three, वाग्यताः observing silence, संहिताः intently, सन्ध्याम् evening worship, समुपासत performed.

Thereafter Lakshmana also drank the remainder of water. Then all the three observing silence intently performed the evening worship.