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 "Truly, Allah does not remove Sacred Knowledge by taking it out of servants, but rather by taking back the souls of Islamic scholars [in death], until, when He has not left a single scholar, the people take the ignorant as leaders, who are asked for and who give Islamic legal opinion without knowledge, misguided and misguiding"

(Sahih Bukhari - Fath al-Bari, 1.194, hadith 100) [src: suhba.org]

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"The Messenger of Allah  (صلى الله عليه وآله وسلم) said:‘Verily Allah the Almighty has prescribed the obligatory deeds, so do not neglect them; He has set certain limits, so do not go beyond them; He has forbidden certain things, so do not indulge in them; and He has said nothing about certain things, as an act of mercy to you, not out of forgetfulness, so do not go enquiring into these.‘"

[It was narrated on the authority of Abi Tha'labah Al-Khushani Jurthum bin Nashir, radiyallahu 'anhu - Related by Al-Daraqutni and others - Al-Nawawi said this is a hasan (fine) hadith]

" إِنَّ اللهَ تَعَالَى فَرَضَ فَرَائِضَ فَلاَ تُضَيِّعُوهَا، وَحَدَّ حُدُوداً فَلاَ تَعْتَدُوهَا، وَحَرَّمَ أَشْيَاءَ فَلاَ تَنْتَهِكُوهَا، وَسَكَتَ عَنْ أَشْيَاءَ رَحْمَةً لَكُمْ غَيْرَ نِسْيَانٍ فَلاَ تَبْحَثُوا عَنْهَا"
[حَدِيثٌ حَسَنٌ رَوَاهُ الدَّارَقُطْنِي وَغَيْرُهُ]

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It is narrated by ‘Umar bin al-Khattāb that the Prophet (صلى الله عليه وآله وسلم) said:

"Among Allāh’s servants there are some who are neither prophets nor martyrs but on the Day of Judgement the prophets and the martyrs will envy their grades. The Companions asked: ‘O Messenger of Allāh, tell us, who are those people?’ He replied: ‘those are the people who love one another on Allāh’s count. They are neither related to one another nor do they have any property to exchange. I swear on Allāh that they will have faces of light,they will be on pulpits of light. They will not have any fear when others will be afraid, they will not have any grief when others will be aggrieved.’ Then he recited the verse: Beware! No doubt, there is no fear for the friends of Allāh nor shall they be sad and sorrowful. "

[Qur’ān (Yūnus, Jonah) 10:62.]

Abū Dāwūd, Sunan, b. of ijārah (wages) 3:288 (#3527); Bayhaqī, Shu‘ab-ul-īmān, (6:486#8998,8999); Khatīb Tabrīzī, Mishkāt-ul-masābīh, b. of adab (good manners) ch.16 (3:75-6#5012).  [src: Ch3 of Beseeching for Help, Tahir-ul-Qadri]

 "Allāh’s Messenger (صلى الله عليه وآله وسلم) said: when Allāh loves some person, He sends for Jibrīl and commands him: verily, I love such and such person; you should also love him, so Jibrīl loves him as well. Then Jibrīl proclaims in the heavens that Allāh loves such and such person; you should also love him. Then the residents of the heavens love him as well. Then his love is sent down to the earth (the world)."

Narrated by Abū Hurayrah (Radi Allah Ta'lah Anhu).  Muslim transmitted it in his as-Sahīh, b. of birr was-silah wal-ādāb (virtue, joining of the ties of relationship and good manners) ch.48 (4:2030#157/2637); Bakhārī narrated it at three places in his as-Sahīh: b. of bad’-ul-khalq (beginning of creation) ch.6 (3:1175#3037), b. of adab (good manners) ch.41 (5:2246#5693), and b. of tawhīd (Islamic monotheism) ch.33 (6:2721#7047); Ahmad bin Hambal in Musnad (2:413); Mālik bin Anas in al-Muwattā, b. of sha‘ar (hair) ch.5 (2:953#15); and Khatīb Tabrīzī in Mishkāt-ul-masābīh, b. of ādāb (good manners) ch.16 (3:74#5005). [src: Ch3 of Beseeching for Help, Tahir-ul-Qadri]