What is the ruling on not articulating the letter "Hāʾ" clearly in "In shāʾ Allāh" (God willing), "Al-ḥamdu Lillāh" (Praise be to God), "Subḥān Allāh" (Glory be to God), and "As-salāmu ʿalaykum wa raḥmatullāh" (Peace be upon you and the mercy of God) both inside and outside of prayer, and does the ruling differ between the two?

It is not permissible to omit the letter 'hāʾ' from the name "Allah" if the intention is to belittle it. However, if it is done out of habit and is not understood as disparagement, then it appears to be permissible, although it is preferable to pronounce it in full. As for acts of worship, omitting the 'hāʾ' is not sufficient in obligatory remembrance, such as the takbīrat al-iḥrām (the opening takbīr in prayer) and the tasmiyah (uttering "Bismillah") over a slaughtered animal. There is a difference of opinion regarding the validity of an oath if the 'hāʾ' is omitted. If the pronunciation of the 'hāʾ' is light or quick at the end of a sentence, it is considered as if it were pronounced. The prayer is not invalidated by omitting the 'hāʾ' from the glorious name in the taslīm (salutation at the end of prayer) because it is not obligatory.