SB 10.46.35

hatvā kaṁsaṁ raṅga-madhye
 pratīpaṁ sarva-sātvatām
yad āha vaḥ samāgatya
 kṛṣṇaḥ satyaṁ karoti tat
Synonyms: 
hatvā — having killed; kaṁsam — Kaṁsa; raṅga — the arena; madhye — within; pratīpam — the enemy; sarva-sātvatām — of all the Yadus; yat — what; āha — He spoke; vaḥ — to you; samāgatya — by coming back; kṛṣṇaḥ — Kṛṣṇa; satyam — true; karoti — will make; tat — that.
Translation: 
Having killed Kaṁsa, the enemy of all the Yadus, in the wrestling arena, Kṛṣṇa will now surely fulfill His promise to you by coming back.