Is placing the hands on the knees during bowing (ruku') obligatory or a recommended practice (sunnah)?

Question : If he does not have a beard and the pocket is open and has no buttons, is it permissible for him to place his hand there?

Answer : The answer is yes, it is permissible. This is because placing the hands on the knees during bowing (ruku') is not obligatory; it is a recommended practice (sunnah), a sunnah.