What is the correct response to the phrase "Survival is for God" (al-baqāʾ li-llāh) during condolences, mentioning the hadith reported concerning it, clarifying its rank and authenticity, and who narrated it?

It is a Sunnah (definition) to offer condolences to the family of the deceased and to encourage them to be patient. The best wording for offering condolences is what was narrated from the Prophet, peace and blessings be upon him: "Indeed, to Allah belongs what He has taken and to Him belongs what He has given, and everything with Him has an appointed term. So be patient and seek reward." It is also permissible to use other phrases such as "May Allah magnify your reward" or "May Allah make your solace good and forgive your deceased." It is desirable for the one receiving condolences to respond with a supplication for the one offering condolences, such as: "May Allah reward you with goodness," or "May Allah have mercy on us and on you and answer your prayer." Expressions of condolences are not limited to specific phrases; rather, any words that offer solace are permissible, and so is the response to them.