One verse

Srimad Bhagavatam 8.7.43

8.7.43

तस्यापि दर्शयामास स्ववीर्यं जलकल्मष: । यच्चकार गले नीलं तच्च साधोर्विभूषणम् ॥ ४३ ॥

tasyapi darsayam asa sva-viryam jala-kalmasah yac cakara gale nilam tac ca sadhor vibhusanam

tasya
of Lord Siva
api
also
darsayam asa
exhibited
sva-viryam
its own potency
jala-kalmasah
that poison born of the water
yat
which
cakara
made
gale
on the neck
nilam
bluish line
tat
that
ca
also
sadhoh
of the saintly person
vibhusanam
ornament.

As if in defamation, the poison born from the ocean of milk manifested its potency by marking Lord Siva’s neck with a bluish line. That line, however, is now accepted as an ornament of the Lord.