[16].Surah An-Nahl [The Bees] : Ayat 51-52

Ayat 51. And Allah said (O mankind!): "Take not ilâhaîn (two gods in worship, etc.). Verily, He (Allah) is (the) only One Ilâh (God). Then, fear Me (Allah) much [and Me (Alone), i.e. be away from all kinds of sins and evil deeds that Allah has forbidden and do all that Allah has ordained and worship none but Allah] . 
Ayat 52. To Him belongs all that is in the heavens and (all that is in) the earth and Ad-Din Wasiba is His [(i.e. perpetual sincere obedience to Allah is obligatory). None has the right to be worshipped but Allah)]. Will you then fear any other than Allah? 

Hazrat Anas bin Malik (May Allah be pleased with him) reported: Messenger of Allah  [SAWW](PBUH) delivered a Khutbah to us the like of which I had never heard from him before. In the course of the Khutbah, he said: "If you knew what I know, you would laugh little and weep much". Thereupon those present covered their faces and began to sob.

[Al-Bukhari 08, Chapter 76, Hadith # 493]. 

Lesson : as mentioned above in Surah An-Nahl Ayat 52. None has the right to be worshipped but Allah)]. Will you then fear any other than Allah? This Hadith has been mentioned in this chapter for the reason that it furnishes positive proof of the fact that the Companions of the Prophet  [SAWW](PBUH) used to weep out of fear of Allah when they heard sermons and preachings. It induces us to follow them.