Valmiki Ramayana 2.69.29

2.69.29

vihīnāṃ patiputrābhyāṃ kausalyāṃ pārthivātmajaḥ
evam āśvasayann eva duḥkhārto nipapāta ha

Thus with his words he undeceived
Kaus'alyá's troubled heart, who grieved
For son and husband reft away;
Then prostrate on the ground he lay.
Him as he lay half-senseless there,
Freed by the mighty oaths he sware,
Kaus'alyá, by her woe distressed,
With melancholy words addressed:
'Anew, my son, this sorrow springs
To rend my heart with keener stings:
These awful oaths which thou hast sworn
My breast with double grief have torn.
Thy soul, and faithful Lakshman's too,
Are still, thank Heaven! to virtue true.
True to thy promise, thou shalt gain
The mansions which the good obtain.'