and We supported him with the Pure Spirit [i.e., Gabriel].
llah supported Jesus with Gabriel, accompanying him in his conditions because the ordeals which he suffered require support. Like the ordeal of his birth without a father and the ordeal when they tried to kill him.
Allah said ( interpretation of the meaning ) :
{ Those messengers - some of them We caused to exceed others. Among them were those to whom Allah spoke, and He raised some of them in degree. And We gave Jesus, the son of Mary, clear proofs, and We supported him with the Pure Spirit [i.e., Gabriel]. If Allah had willed, those [generations] succeeding them would not have fought each other after the clear proofs had come to them. But they differed, and some of them believed and some of them disbelieved. And if Allah had willed, they would not have fought each other, but Allah does what He intends. }
Quran ( 2 : 253 )