Is uttering the Two Testimonies before death a sign of a good end, and must they be uttered audibly?

Among the signs of a good ending is that the last words uttered by a person are the declaration of faith (Shahada), based on the Prophet's (peace be upon him) saying: "Whoever's last words are 'La ilaha illa Allah' (There is no god but Allah) will enter Paradise." It is not a condition for the utterance to be audible to others; rather, it is sufficient for the person to hear themselves in the usual circumstance, or merely to move the tongue, according to some scholars. What is more important is to honor one's parents after their death through supplication, seeking forgiveness for them, and giving charity on their behalf.