Ibn Kathir’s fatwa on khatemiyat

Allama Ibn Kathir (died A.H. 774) writes in his well- known commentary, “Hence this verse is a clear proof of the fact that no prophet will come after Mohammed (pbuh) and when it is said that no prophet will come after him it is a foregone conclusion that no messenger will succeed him either, for the office of a messenger holds prominence over the office of a prophet. Every messenger is a prophet, but all prophets are not messengers. Any one who lays a claim to prophethood after Mohammed (pbuh) is a liar, a disruptionist, an imposter, depraved and a seducer despite his wonderous jugglery and magical feats. Any one who would make this claim in future till the end of the world belongs to this class. (Vol. 3, pp. 493-494)

Covenant from other prophets

In The Name of Allah The Most Beneficent The Most Merciful

Ameerul Momeneen Ali Ibne Abi Talib (a.s.) says,
“Allah did not raise any Prophet- from Adam (a.s.) and all who came after him- but that He took a covenant from him that if this Prophet was alive and the Holy Prophet Muhammad (s.a.w.a.) was appointed, he should believe in and support him. And they (Prophets) were also commanded to take a similar pledge from their nation and people.”

(Tafseer-e-Tabari, v.3, p. 236; Tafseer-e-Ibn Katheer, v.1, p.378; Tafseer al-Durr al-Manthoor;
Tafseer-e-Qurtubi, v.4, p.125; Tafseer-e-Kabeer, v.8, p.155 narrating from Awaamel-e-Tahreef, v.4, p.15)

Allah the Almighty took an oath from the Prophets (a.s.) that they should inform their nations and communities of the appointment and elevated status of the Holy Prophet (s.a.) and should command them that if they survive till his advent, they should provide testimony for his prophethood.
(Tafseer-e-Tibyaan, v.2, p.513; Tafseer-e-Majmaul Bayaan, v.2, p. 468; Tafseer-e-Saafi, v.1, p.274-narrating from Awaamel-e-Tahreef, v.4, p.15)