One verse

Srimad Bhagavatam 10.80.4

10.80.4

शिरस्तु तस्योभयलिङ्गमान- मेत्तदेव यत् पश्यति तद्धि चक्षु: । अङ्गानि विष्णोरथ तज्जनानां पादोदकं यानि भजन्ति नित्यम् ॥ ४ ॥

śiras tu tasyobhaya-liṅgam ānamet tad eva yat paśyati tad dhi cakṣuḥ aṅgāni viṣṇor atha taj-janānāṁ pādodakaṁ yāni bhajanti nityam

śiraḥ
head
tu
and
tasya
of Him
ubhaya
both
liṅgam
to the manifestations
ānamet
bows down
tat
that
eva
only
yat
which
paśyati
sees
tat
that
hi
indeed
cakṣuḥ
eye
aṅgāni
limbs
viṣṇoḥ
of Lord Viṣṇu
atha
or
tat
His
janānām
of the devotees
pāda-udakam
the water which has washed the feet
yāni
which
bhajanti
honor
nityam
regularly

An actual head is one that bows down to the Lord in His manifestations among the moving and nonmoving creatures, real eyes are those that see only the Lord, and actual limbs are those which regularly honor the water that has bathed the Lord’s feet or those of His devotees.