CC Madhya 19.199-200
he kṛṣṇa he yādava he sakheti
ajānatā mahimānaṁ tavedaṁ
mayā pramādāt praṇayena vāpi
eko ’tha vāpy acyuta tat-samakṣaṁ
tat kṣāmaye tvām aham aprameyam
sakhā — friend; iti — thus; matvā — thinking; prasabham — forcibly; yat — that which; uktam — was said; he kṛṣṇa — O Kṛṣṇa; he yādava — O descendant of Yadu; he sakhā — O my dear friend; iti — thus; ajānatā — without knowing; mahimānam — greatness; tava — Your; idam — this; mayā — by me; pramādāt — out of ignorance; praṇayena — out of affection; vā — or; api — certainly; yat — whatever; ca — and; avahāsa-artham — for the matter of joking; asat-kṛtaḥ — insulted; asi — You are; vihāra — while enjoying; śayyā-āsana — sitting or lying on the bed; bhojaneṣu — while eating together; ekaḥ — alone; atha vā — or; api — certainly; acyuta — O my dear Kṛṣṇa; tat-samakṣam — in the presence of others; tat — all those; kṣāmaye — ask pardon; tvām — unto You; aham — I; aprameyam — who are unlimited.
“ ‘Thinking of You as my friend, I have rashly addressed You “O Kṛṣṇa,” “O Yādava,” “O my friend,” not knowing Your glories. Please forgive whatever I may have done in madness or in love. I have dishonored You many times, jesting as we relaxed, lay on the same bed, or sat or ate together, sometimes alone and sometimes in front of many friends. O infallible one, please excuse me for all those offenses.’
This is a quotation from the Bhagavad-gītā (11.41-42). In this verse, Arjuna is addressing Kṛṣṇa, who was exhibiting His universal form on the Battlefield of Kurukṣetra.