[16].Surah An-Nahl [The Bees] : Ayat 102

Ayat 102. Say (O Muhammad  [SAWW](PBUH) Ruh-ul-Qudus [Jibrael (Gabriel)] has brought it (the Qur'an) down from your Lord with truth, that it may make firm and strengthen (the Faith of) those who believe and as a guidance and glad tidings to those who have submitted (to Allah as Muslims).

Hazrat Ibn `Abbas (May Allah be pleased with them) reported: The Messenger of Allah [SAWW](PBUH) said to Jibril (Gabriel), "What prevents you from visiting us more frequently?'' Thereupon was revealed the Ayah: "(The angels say:) `And we (angels) descend not except by the Command of your Rubb. To Him belongs what is before us and what is behind us, and what is between those two". (19:64)

[Al-Bukhari Book 06, Chapter 60, Hadith # 255]. 

Lesson : as mentioned above in Surah An-Nahl Ayat 102.Ruh-ul-Qudus [Jibrael (Gabriel)] has brought it (the Qur'an) down from your Lord with truth,This Hadith tells us about the Prophet's desire for meeting angel Jibril (Gabriel) to have that knowledge which was revealed to him by means of Wahy (Revelation). It also tells us that angels descend to earth for certain mission by the Command of Allah. They have no say of their own in any matter. It also indicates that it is permissible to enquire about Muslim brothers after a long period of time as this is a sign of true love.