Canto 2 -
Ayodhyā-kāṇḍa
Chapter 25: Kausalyā Invokes Auspiciousness for Rāma
Text 2.25.32
यन्मङ्गलं सहस्राक्षे सर्वदेवनमस्कृते।
वृत्रनाशे समभवत्तत्ते भवतु मङ्गलम्॥
yat maṅgalam = auspiciousness; sahasra-akṣe = upon the thousand-eyed Indra; sarva-deva-namaskṛte = who was honored by all the devas; vṛtra-nāśe = upon the destruction of Vṛtra; samabhavat = invoked; tat = the; te = upon You; bhavatu maṅgalam = may be invoked.
May the auspiciousness invoked upon the thousand-eyed Indra, who was honored by all the devas upon the destruction of Vṛtra, be invoked upon You!1
1 The significant history of Vṛtrāsura is elaborated by Śrīla Śukadeva Gosvāmī in Chapters 7 to 17 of Canto 6 of Śrīmad-Bhāgavatam.