Isaiah 38:5
3 “Please, Lord. Remember how I have served you faithfully and with wholehearted devotion, and how I have carried out your will.” Then Hezekiah wept bitterly. 4 The Lord’s message came to Isaiah, 5 “Go and tell Hezekiah: ‘This is what the Lord God of your ancestor David says: “I have heard your prayer; I have seen your tears. Look, I will add 15 years to your life. 6 I will also rescue you and this city from the king of Assyria. I will shield this city.”’” 7 Isaiah replied, “This is your sign from the Lord confirming that the Lord will do what he has said:
Sirach 48:22
Ben Sira, Ecclesiasticus20 But they called upon the Lord who is merciful, spreading out their hands toward him. The Holy One quickly heard them from heaven, and delivered them through Isaiah. 21 The Lord struck down the camp of the Assyrians, and his angel wiped them out. 22 For Hezekiah did what was pleasing to the Lord, and he kept firmly to the ways of his ancestor David, as he was commanded by the prophet Isaiah, who was great and trustworthy in his visions. 23 In Isaiah's days the sun went backward, and he prolonged the life of the king. 24 By his dauntless spirit he saw the future, and comforted the mourners in Zion.
Notes and References
"... Ben Sira displays his knowledge of prophetic history generally and appears to refer to a specific collection of Twelve Prophets. In his narrative history, he refers to the three major prophets in the same order found in the Hebrew canon, from Isaiah (Sirach 48:22), to Jeremiah (49:6), to Ezekiel (49:8), culminating with a reference to the Twelve Prophets (49:10). Ben Sira meticulously only uses the title prophet to refer to characters from the conquest of the land until the exile, indicating that he has a specific concept in mind. These prophets are not merely sages, but speak for God and see visions (46:13, 16). He also references the Twelve Prophets in a similar form to that found in the later Masoretic Text: “And also the Twelve Prophets” (49:10). The use of the title “the Twelve Prophets” is likely an assumed recognizable entity. Ben Sira seems to be familiar with the twelve books as a grouping of prophetic writings. In conclusion, we see that he is familiar with a prophetic history like that found in the Jewish Scriptures and regards them as instructive for his community ..."
Beckman, Peter Ben Sira’s Canon Conscious Interpretive Strategies: His Narrative History and Realization of the Jewish Scriptures (pp. 562-575) Themelios, Vol. 46, Issue 3, 2021