This is a hadith whose chain of transmission is not continuous; in my view it is interrupted (mursal), and in my opinion Ibn Ashwaʿ did not meet Yazīd ibn Salamah.
And Ibn Ashwaʿ's name is: Saʿīd ibn Ashwaʿ.

2879 — Abū Kurayb narrated to us, saying: Khalaf ibn Ayyūb narrated to us, from ʿAwf, from Ibn Sīrīn, from Abū Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "Two traits are never combined in a hypocrite: good conduct, and understanding in religion."(1)
This hadith is strange (gharīb), and we do not know this hadith from the narrations of ʿAwf except through this shaykh: Khalaf ibn Ayyūb al-ʿĀmirī. And I have not seen anyone narrating from him other than Muḥammad ibn al-ʿAlāʾ, and I do not know how he is.

2880 — Muḥammad ibn ʿAbd al-Aʿlā narrated to us, saying: Salamah ibn Rajāʾ narrated to us, saying: al-Walīd ibn Jamīl narrated to us, saying: al-Qāsim Abū ʿAbd al-Raḥmān narrated to us, from Abū Umāmah al-Bāhilī, who said: Two men were mentioned to the Messenger of Allah, peace and blessings be upon him — one of them was a worshipper and the other was a scholar — so the Messenger of Allah, peace and blessings be upon him, said: "The superiority of the scholar over the worshipper is like my superiority over the least of you." Then he said: "Indeed, Allah, His angels, the inhabitants of the heavens and the earth, even the ant in its hole and even the fish, send blessings upon the one who teaches people what is good."

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(1) Its chain is good (ḥasan); Khalaf ibn Ayyūb is truthful (ṣadūq) with good hadiths, and a number of trustworthy narrators have narrated from him, including Imam Aḥmad. None criticized him except Yaḥyā ibn Maʿīn. Al-Khalīlī said in "al-Irshād": Truthful and well-known; he was described as having integrity, righteousness, and asceticism. Al-Dhahabī declared him trustworthy in "al-Kāshif," and said in "al-Mughnī": Truthful. He described him in "al-Siyar" as: the imam, muḥaddith, jurist, muftī of the East, the Balkhī Ḥanafī ascetic, the scholar of the people of Balkh. The rest of his narrators are trustworthy.
It was also recorded by al-ʿUqaylī in "al-Ḍuʿafāʾ" 2/24, and al-Ṭabarānī in "al-Awsaṭ" (8006).