Abu Saeed al-Khudri reported the Messenger of Allah ﷺ as saying: If anyone says "I am pleased with Allah as Lord, with Islam as religion and with Muhammad ﷺ as Messenger" Paradise will be his due.
Hadith Referenceسنن ابي داود / كتاب تفريع أبواب الوتر / 1529
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح
´It was narrated from Abu Sa'eed Al-Khudri that the Messenger of Allah (ﷺ) said:` "O Abu Sa'eed! Whoever is content with Allah as Lord, Islam as his religion and Muhammad as Prophet, then he is guaranteed Paradise." Abu Sa'eed found this amazing and said: "Say it to me again, O Messenger of Allah." So he did that, then the Messenger of Allah (ﷺ) said: "And there is something else by means of which a person may be raised one hundred degrees in Paradise, each of which is like that which is between the Heaven and the Earth." He said: "What is it, O Messenger of Allah?" He said: "Jihad in the cause of Allah, Jihad in the cause of Allah."
Hafiz Muhammad Ameen
“They seemed very strange” because, apparently, Paradise has been promised for something easy, although in reality this is a very difficult task, because knowledge of contentment (rida) will be determined by actions. And providing proof of faith through actions itself is a difficult task. Another meaning could be that “they seemed very excellent,” because for the believer this is a tremendous glad tidings.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3133