What is the ruling on combining and shortening prayers for an Egyptian citizen residing in the Kingdom of Saudi Arabia for an unspecified period, and what is the authenticity of what was mentioned in the book "Fiqh Al-Sunnah" quoting Ibn Al-Qayyim?

If you intend to reside in the Kingdom of Saudi Arabia for four days or more, you are not permitted to shorten your prayers (qasr) or combine two prayers (jama‘), and this is the view of the majority of scholars. As for what was narrated from Ibn Al-Qayyim, even though a group of scholars adopted it and Sheikh Ibn ‘Uthaymeen preferred it, the chosen view is that of the majority.