Śrīmad-Bhāgavatam · Text 10.69.25
Who is speaking and story frame
क्वापि सन्ध्यामुपासीनं जपन्तं ब्रह्म वाग्यतम् ।
एकत्र चासिचर्माभ्यां चरन्तमसिवर्त्मसु ॥ २५ ॥
kvāpi sandhyām upāsīnaṁ
japantaṁ brahma vāg-yatam
ekatra cāsi-carmābhyāṁ
carantam asi-vartmasu
Somewhere Lord Kṛṣṇa was observing the rituals for worship at sunset by refraining from speech and quietly chanting the Gāyatrī mantra, and elsewhere He was moving about with sword and shield in the areas set aside for sword practice.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.