This Khutbah was given by Imam Khalid Latif at the Islamic Center at NYU on Friday, April 6th, 2012 in which he discusses the importance of thanking others and expressing gratitude for them and the dangers of being ungrateful.
Abu Hurairah reported: The Prophet, peace be upon him, said, “He has not thanked Allah who has not thanked people.”
[Sunan Abu Dawud, Book 40, Number 4811]
عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ لاَ يَشْكُرُ اللَّهَ مَنْ لاَ يَشْكُرُ النَّاسَ