Śrīmad-Bhāgavatam 3.13.22
దృష్టోఽఙ్గుష్ఠశిరోమాత్ర: క్షణాద్గణ్డశిలాసమ: ।
అపి స్విద్భగవానేష యజ్ఞో మే ఖేదయన్మన: ॥ ౨౨ ॥
dṛṣṭo ’ṅguṣṭha-śiro-mātraḥ
[drishto ’ngushtha-shiro-maatrah]
kṣaṇād gaṇḍa-śilā-samaḥ
[kshanaad ganda-shilaa-samah]
api svid bhagavān eṣa
[api svid bhagavaan esha]
yajṣo me khedayan manaḥ
[yajsho me khedayan manah]
Word-for-word
dṛṣṭaḥ
—
just seen
aṅguṣṭha
—
thumb
śiraḥ
—
tip
mātraḥ
—
only
kṣaṇāt
—
immediately
gaṇḍa-śilā
—
large stone
samaḥ
—
like
api svit
—
whether
bhagavān
—
the Personality of Godhead
eṣaḥ
—
this
yajṣaḥ
—
Viṣṇu
me
—
my
khedayan
—
perturbing
manaḥ
—
mind.
Blended reading (Sanskrit + English inline)
dṛṣṭo ’ṅguṣṭha-śiro-mātraḥ
dṛṣṭaḥ
just seen
kṣaṇād gaṇḍa-śilā-samaḥ
aṅguṣṭha
thumb
śiraḥ
tip
mātraḥ
only
kṣaṇāt
immediately
api svid bhagavān eṣa
gaṇḍa-śilā
large stone
samaḥ
like
api svit
whether
bhagavān
the Personality of Godhead
eṣaḥ
this
yajṣo me khedayan manaḥ
yajṣaḥ
Viṣṇu
me
my
khedayan
perturbing
manaḥ
mind.
First of all this boar was seen no bigger than the tip of a thumb, and within a moment He was as large as a stone. My mind is perturbed. Is He the Supreme Personality of Godhead, Viṣṇu?
Purport
Since Brahmā is the supermost person in the universe and he had never before experienced such a form, he could guess that the wonderful appearance of the boar was an incarnation of Viṣṇu. The uncommon features symptomatic of the incarnation of Godhead can bewilder even the mind of Brahmā.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
Appearing first the size of the tip of my thumb, he has quickly become the size of a huge boulder. Perhaps he is the Supreme Lord Yajṣa, who is disturbing my mind with doubts.
Yajṣa here refers to the form of the Lord who was the Manvantara avatāra during this period. He disturbs Brahmā’s mind because of giving him doubts about this extraordinary form.
My note
Source: vedabase.io