 it was narrated that when the messenger of god arrived at khaybar they came upon a green date and ate it then they were afflicted with fever and were guided. so the messenger of god ordered them to bring water at night in the winter and when it is between the two ears pour water over yourselves and mention the name of god over it. so they did and it was as if they had been freed from the shackles.
وروي أن رسول الله لما قدم خيبر قدموا على تمرة خضراء فأكلوا فأصابتهم الحمى فاهتدتهم فأمرهم رسول الله أن يقدموا الماء في الليل في الشتاء فإذا كان بين الأذنين فأفيضوا الماء عليكم واذكروا اسم الله عليه ففعلوا فكأنما انشطوا من العقال.