One verse

Srimad Bhagavatam 11.18.1

11.18.1

श्रीभगवानुवाच वनं विविक्षु: पुत्रेषु भार्यां न्यस्य सहैव वा । वन एव वसेच्छान्तस्तृतीयं भागमायुष: ॥ १ ॥

śrī-bhagavān uvāca vanaṁ vivikṣuḥ putreṣu bhāryāṁ nyasya sahaiva vā vana eva vasec chāntas tṛtīyaṁ bhāgam āyuṣaḥ

śrī-bhagavān uvāca
the Supreme Personality of Godhead said
vanam
the forest
vivikṣuḥ
desiring to enter
putreṣu
among the sons
bhāryām
wife
nyasya
entrusting
saha
together with
eva
indeed
vā
or
vane
in the forest
eva
certainly
vaset
one should dwell
śāntaḥ
with a peaceful mind
tṛtīyam
the third
bhāgam
division
āyuṣaḥ
of life

The Supreme Personality of Godhead said: One who desires to adopt the third order of life, vānaprastha, should enter the forest with a peaceful mind, leaving his wife with his mature sons, or else taking her along with him.