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Allah is Ar-Raqib, He watches all and never forgets what He has created. Allah is a vigilant witness and acts as a guardian protecting the weak and innocent. He observes all thoughts, deeds and feelings.
Mentions From The Quran & Hadith
From the root r-q-b which has the following classical Arabic connotations: to look, watch, be vigilant to expect, anticipate, await. To keep an eye on, detect, observe to be mindful of. To be a spy, scout, observer to regard, hold in consideration, and respect.
Ibn al-Qayyim wrote, “The key to the daʿwah of the Messengers and the essence of their Message, is knowing Allah through His Names, His Attributes, and His Actions. This is the foundation on which the rest of the Message, from beginning to end, is based upon.”
Allah said, “To Allah Alone belong the most Beautiful Names, so call on Him by them.” (7:180)

http://path2islam.com/eng/index.php/articles/matters-of-the-heart/2228-sincerity-in-the-quran-and-sunnah-2
http://path2islam.com/eng/index.php/articles
http://path2islam.com/eng/index.php/articles/mercy-of-allah-in-the-quran
http://path2islam.com/eng/index.php/know-allah/asmaallah
http://path2islam.com/eng/index.php/the-quran/quran-audio-recitations
http://path2islam.com/eng/index.php/articles/matters-of-the-heart/2158-the-duas-of-the-prophets-and-the-pious
http://asmaallah.com/
http://dawahoffice.com/
http://dawahguide.net/
http://kuran4all.com/
https://edialogue.org/

Sincerity in The Quran and Sunnah
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Verily, Allah does not look at your appearance or wealth, but rather he looks at your hearts and actions.”
Source: Ṣaḥīḥ Muslim 2564
Grade: Sahih (authentic) according to Muslim

http://path2islam.com/eng/index.php/articles/matters-of-the-heart/2219-sincerity-in-the-quran-and-sunnah
http://path2islam.com/eng/index.php/articles/matters-of-the-heart/2228-sincerity-in-the-quran-and-sunnah-2
http://path2islam.com/eng/index.php/the-quran/calls-of-the-most-merciful

CALLS OF THE MOST MERCIFUL
يَا أَيُّهَا النَّاسُ اعْبُدُوا رَبَّكُمُ الَّذِي خَلَقَكُمْ وَالَّذِينَ مِن قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُونَ ‎﴿البقرة: ٢١﴾
O ! mankind , worship your Lord, who created you and those before you, that you may become righteous
Quran Surah 2 Al Baqara verse 21

http://path2islam.com/eng/index.php/the-quran/calls-of-the-most-merciful