Al-Isra 17:85

<h2>The Ruh (spirit)</h2><p>Al-Bukhari recorded in his Tafsir of this Ayah that `Abdullah bin Mas`ud said, "While I was walking with the Prophet on a farm, and he was resting on a palm-leaf stalk, some Jews passed by. Some of them said to the others, `Ask him about the Ruh.' Some of them said, `What urges you to ask him about that' Others said, `Do not ask him, lest he gives you a reply which you do not like.' But they said, `Ask him.' So they asked him about the Ruh. The Prophet kept quiet and did not give them an answer, and I knew that he was receiving revelation, so I stayed where I was. When the revelation was complete, the Prophet said:</p><p>وَيَسْـَلُونَكَ عَنِ الرُّوحِ قُلِ الرُّوحُ مِنْ أَمْرِ رَبِّى</p><p>(And they ask you concerning the Ruh (the spirit). Say: "The Ruh (the spirit) is one of the things, the knowledge of which is only with my Lord...") This context would seem to imply that this Ayah was revealed in Al-Madinah, and that it was revealed when the Jews asked him this question in Al-Madinah, although the entire Surah was revealed in Makkah. This may be answered with the suggestion that …

They are asking thee concerning the Spirit. Say: The Spirit is by command of my Lord, and of knowledge ye have been vouchsafed but little.

They ask thee concerning the Spirit (of inspiration). Say: "The Spirit (cometh) by command of my Lord: of knowledge it is only a little that is communicated to you, (O men!)"

And they ask you (O Muhammad SAW) concerning the Ruh (the Spirit); Say: "The Ruh (the Spirit): it is one of the things, the knowledge of which is only with my Lord. And of knowledge, you (mankind) have been given only a little."

And they ask you about the Spirit. Say, “The Spirit belongs to the domain of my Lord; and you were given only little knowledge.”