औपनायनिकः कालो ब्रह्मक्षत्र विशां परः । आ षोडशादाद्वाविंशादा चतुर्विंशदब्दतः
aupanāyanikaḥ kālo brahmakṣatra viśāṃ paraḥ | ā ṣoḍaśādādvāviṃśādā caturviṃśadabdataḥ
ウパナヤナ(入門の聖儀)の正しい時期は、ブラーフマナは十六歳まで、クシャトリヤは二十二歳まで、ヴァイシャは二十四歳までである。
Skanda (deduced: Kāśīkhaṇḍa commonly Skanda → Agastya)
Saṃskāras must be performed in their proper season; timely initiation safeguards dharma and learning.
The instruction belongs to Kāśī Khaṇḍa’s dharma-context for Kāśī, though no specific tirtha is named in this verse.
Upanayana timing is prescribed with upper age thresholds for the three varṇas mentioned.