ChU 1.5.4
एतम् उ एवाहम् अभ्यगासिषं तस्मान् मम त्वम् एको ऽसीति ह कौषीतकिः पुत्रम् उवाच । प्राणांस् त्वं भूमानम् अभिगायताद् बहवो वै मे भविष्यन्तीति
etam u evāham abhyagāsiṣaṃ tasmān mama tvam eko 'sīti ha kauṣītakiḥ putram uvāca | prāṇāṃs tvaṃ bhūmānam abhigāyatād bahavo vai me bhaviṣyantīti
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
'Him I sang praises to, therefore art thou my only son,' thus said Kaushîtaki to his son. 'Do thou therefore sing praises to the breath as manifold, if thou wishest to have many sons.'
Translated by F. Max Müller