tumi jāna—you know; kṛṣṇa—Lord Kṛṣṇa; nija-pratijñā—His own promise; chāḍilā—gave up; bhakta kṛpā-vaśe—being obliged by the devotional service of a devotee; bhīṣmera—of Grandfather Bhīṣma; pratijñā rākhilā—kept the promise.