The verse says...
"Certainly you will find the most hostile of people to those who believe are the Jews and pagans; and you will certainly find the nearest of them in affection to those who believe are those who say: 'We are Christians.' That is because there are among them priests and monks and because they do not behave proudly." The good treatment of Najashi, the king of Abyssinia, and the Christians of that country unto the emigrated Muslims has been cited upon the occasion of revelation of this verse.
In the fifth year after the appointment of the Prophet (S) to his mission, a group of Muslims under the management of Ja'far-ibn-'Abi-talib emigrated from Mecca to Abyssinia and became secured from the harm and hurt of the pagans of Mecca with the support of Najashi. They were secured from the harm of the agents of the pagans there, too. The Jews, even with seeing those abundant miracles and also the good temper of the Prophet (S), did not believe in Islam.
They participated in plots against Muslims. They did breach promises and made mischief, while some Christian bishops in Abyssinia shed tears when they heard the verses of Surah Maryam and adhered those Muslims who were there. Thus, the Jews are the most obstinate enemies of Islam, and their hostility against Muslims has an ancient and deep root. But, the Christians, although wrongly believe in trinity, a deviated creed, are more receptive to accept the truth because of the sounder mind they have.
They are not of the people of plotting, especially the intellectualities and the preachers among them.