Has the word "shahadah" (testimony) or "shaheed" (witness) been mentioned with the meaning of "one killed in the path of Allah" in the Quran or in a Hadith Qudsi, other than in the noble Prophetic Hadith?

The word "martyrdom" (shahadah) is used in the Quran to mean killing in the way of Allah, just as the word "killing" (qatl) is also used for the same meaning. This is evident in His (the Most High's) saying: {and the martyrs and the righteous} [4:69], and His saying: {And the martyrs, with their Lord, for them is their reward and their light} [57:19], and His saying: {those who are killed in the way of Allah are not dead, but alive with their Lord, receiving sustenance} [3:169].