He will hasten it, saying: "I called, but I was not answered."(1)

This is a ḥasan ṣaḥīḥ ḥadīth.

Abū ʿUbayd: his name is Saʿd, and he is the freed slave of ʿAbd al-Raḥmān ibn Azhar, and it is also said: the freed slave of ʿAbd al-Raḥmān ibn ʿAwf. And ʿAbd al-Raḥmān ibn Azhar is the cousin of ʿAbd al-Raḥmān ibn ʿAwf.

On this topic, there is also a narration from Anas.

‌‌13 - Chapter: What has been reported concerning supplication in the morning and in the evening

3685 - Muḥammad ibn Bashshār narrated to us, he said: Abū Dāwūd — namely al-Ṭayālisī — narrated to us, he said: ʿAbd al-Raḥmān ibn Abī al-Zinād narrated to us, from his father, from Abān ibn ʿUthmān, who said:

I heard ʿUthmān ibn ʿAffān say: The Messenger of Allah, peace and blessings be upon him, said: "There is no servant who says, in the morning of every day and in the evening of every night: 'In the name of Allah, with whose name nothing on earth or in heaven can cause harm, and He is the All-Hearing, the All-Knowing,' three times, but that nothing will harm him."

And Abān had been afflicted with a partial paralysis, and a man began looking at him. Abān said to him: "What are you looking at? Indeed, the ḥadīth is as I narrated to you, but I did not —"

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(1) A ṣaḥīḥ ḥadīth, reported by al-Bukhārī (6340), Muslim (2735), Abū Dāwūd (1484), Ibn Mājah (3853), and it is in the "Musnad" (10312), and "Ṣaḥīḥ Ibn Ḥibbān" (975).