"أما يخشى أحدكم إذا رفع رأسه في الصلاة أن لا يرجع ¤ إليه بصره؟ "
The Prophet (peace and blessings be upon him) said:
"Does not any of you fear that, when he raises his head (towards the sky) during prayer, his sight may not be returned to him (that is, it may be taken away)?"
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1340