As I did not know that the Adhan (call to Prayer) had not been announced yet, I performed Salah (Prayer) before it
unintentionally, what is the validity of this Salah?
When the time is due, there is nothing wrong with performing the obligatory Salah before the Adhan. However, it is impermissible for a person to perform Salah before its due time. If this happens, the Salah is null and void. If someone happened to perform Salah before its due time in the past, they should make up for it unless a person is permitted to combine two Prayers in the time of the former prayer due to sickness or travel. In such a case, they are allowed to perform `Asr (Afternoon) Prayer at the time of Zhuhr (Noon) Prayer and perform `Isha' (Night) Prayer at the time of Maghrib (Sunset) Prayer. Due to the lawful excuses (i.e. the sickness and travel), the two combined Salahs are performed at the same time.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.