It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Allah Almighty says, "If a servant remembers Me in his heart, I also remember him in My heart. If he remembers Me in a gathering, I remember him in a gathering better than that."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8650
Hadith Gradingحکم دارالسلام:حدیث صحیح ، خ : 7405 ، م : 2675 ، وله إسنادان ھنا : الأول حسن ، والثاني منقطع ، لأن الحسن لم یسمع من أبي ھریرۃ