CC Ādi 2.106

svayaṁ bhagavān kṛṣṇa, kṛṣṇa sarvāśraya
parama īśvara kṛṣṇa sarva-śāstre kaya
Word for word: 
svayam — Himself; bhagavān — the Supreme Personality of Godhead; kṛṣṇa — Lord Kṛṣṇa; kṛṣṇa — Lord Kṛṣṇa; sarva-āśraya — the shelter of all; parama — Supreme; īśvara — Lord; kṛṣṇa — Lord Kṛṣṇa; sarva-śāstre — all scriptures; kaya — say.
Translation: 
“Thus the Personality of Godhead Śrī Kṛṣṇa is the original, primeval Lord, the source of all other expansions. All the revealed scriptures accept Śrī Kṛṣṇa as the Supreme Lord.