CC Antya 3.224

kṛṣṇe avatārite advaita pratijñā karilā
jala-tulasī diyā pūjā karite lāgilā
Word for word: 
kṛṣṇe — Lord Kṛṣṇa; avatārite — to cause to descend; advaita — Advaita Ācārya; pratijñā — promise; karilā — made; jala-tulasī — Ganges water and tulasī leaves; diyā — offering; pūjā — worship; karite — to do; lāgilā — began.
Translation: 
Determined to deliver all the fallen souls, Advaita Ācārya decided to cause Kṛṣṇa to descend. With this vow, He began to offer Ganges water and tulasī leaves to worship the Lord.