I'laam ul Muwaqqi'een by Ibn Qayyim al-Jawziyyah, vol. 1, p. 48
“islam mein to itna zyada khula pan hai, itna zyada khula pan hai ke main aap ko ek do aap ko batata hoon reference, jaise ke ek bohat hi mana hua principle hai islam mein: "taghayyur al-ahkam bi taghayyur al-zaman wa al-makan".”