Ibn Kathir said in his Tafseer:

Allah says (interpretation of the meaning)

"And from the people is he who worships Allah as if he were on an edge. If good befalls him, he is content with it. And if a trial befalls him, he turns back on his face. He loses both this world and the Hereafter. That is the clear loss." [al-Hajj; 11]

Ibn Kathir said in his Tafseer:

“This means that he enters the religion on an edge. So, if he finds what he likes, he sticks with it. Otherwise, he retreats. al-Bukhari reported that Ibn ‘Abbas said: “A man would come to Madinah. If his wife gave birth to a son, he would say: “This is a good religion.” If his wife didn’t give birth, he would say: “This is a terrible religion.”

"And Ibn Abi Hatim reported that Ibn ‘Abbas said: “Some bedouins would come to the Prophet and become Muslims and then they’d return to their homelands. If they returned to a year of rain, produce, and good children being born, they would say: “This religion of ours is good. So, stick to it.” If they came back to a year of hunger, bad children being born, and drought, they would say: “There is no good in this religion of ours.” So, Allah revealed this verse.”