What is the ruling on saying "Hamdullah 'ala al-salamah"?

There is no harm in saying: "Alhamdulillah 'ala al-salamah (Praise be to Allah for safety)," even if it contains a grammatical error (laḥn) that does not alter the meaning. It is possible that the kasrah (vowel mark for 'i') on the letter dal in "Alhamdulillah" came from the kasrah on the letter lam in "lillah (for Allah)." It is more appropriate to use the eloquent (faṣīḥ) expression: "Ḥamdan lillah 'ala al-salamah (Praise be to Allah for safety)," where "ḥamdan" is an absolute object (mafʿūl muṭlaq) for a deleted verb, estimated as "Aḥmadu ḥamdan (I praise with praise)." It is also permissible to say: "Ḥamdu Allah 'ala al-salamah (The praise of Allah for safety)," meaning: my concern/matter is the praise of Allah. Sibawayh heard someone say: "Ḥamdu Allahi wa thanā'un 'alayhi (The praise of Allah and commendation upon Him)," which he interpreted as implying something hidden in the speaker's intention, as if to say: "My affair and concern is the praise of Allah."