وَأَحسَنُ مِنكَ لَم تَرَ قَطُّ عَيني
وَأَجمَلُ مِنكَ لَم تَلِدِ النِساءُ
خُلِقتَ مُبَرَّءً مِن كُلِّ عَيب
كَأَنَّكَ قَد خُلِقتَ كَما تَشاءُ

And more beautiful than you, my eyes have never seen,
And more perfect than you, women have never given birth.
You were created free of every flaw,
As if you were created exactly as you desire.

Ibn al-Qayyim (رحمه الله) said in Ahkām Ahl Adh-Dhimah (441):

"As for congratulating them on the rituals that are associated with Kufr, then it is unanimously Ḥarām, such as congratulating them on their holidays and practices, and saying: 'Eid Mubarak to you' or expressing joy for the celebration and the like. That is, if the one saying this is free from disbelief, then it is from the prohibited acts. And it is similar to if he congratulates them on their prostration to the cross, for indeed; it is a greater sin in the eyes of Allāh and more detestable than in congratulating the drinking of alcohol, committing murder, engaging in illicit sexual relations and the like."

Anas (may Allah be pleased with him) narrated: “When the Prophet (peace be upon him) became gravely ill, he began to lose consciousness. Fatimah (may Allah be pleased with her) said, ‘Oh, the distress of my father!’ He said to her, ‘There will be no distress for your father after today.’

When he passed away, she said, ‘Oh my father, he has responded to the call of his Lord. Oh my father, whose abode is the Garden of Paradise. Oh my father, we announce your departure to Gabriel.’

When he was buried, Fatimah (may Allah be pleased with her) said, ‘Oh Anas, how could you bring yourselves to throw earth on the Messenger of Allah (peace be upon him)?’”

قال عبد الله بن المبارك:
ما أَعْياني شيء كما أَعْياني أني لا أجد أَخًا في الله عز وجل.

Abdullah ibn al-Mubarak said:
“Nothing has been more difficult for me than not finding a brother for the sake of Allah, the Mighty and Majestic.”

[صفة الصفوة (١٣٩/٤)]

رَبَّنَا اطۡمِسۡ عَلٰٓى اَمۡوَالِهِمۡ وَاشۡدُدۡ عَلٰى قُلُوۡبِهِمۡ فَلَا يُؤۡمِنُوۡا حَتّٰى يَرَوُا الۡعَذَابَ الۡاَلِيۡمَ‏

Our Lord! Destroy their wealth, and harden their hearts, so that they will not believe until they see the painful torment.

وكان سعيد بن جبير إذا صلى العصر لم يكلم أحدا حتى تغرب الشمس

And Sa’īd bin Jubayr did not speak to anyone after the Asr prayer [on Friday] until the sun had set.

‏زاد المعاد (١ / ٣٨٢)

Allah’s Messenger (ﷺ) said:
"None of you will have faith till he loves me more than his father, his children and all mankind."

قال رسول الله ﷺ : لا يؤمن أحدكم حتى أكون أحب إليه من والده وولده والناس أجمعين.

‏صحيح البخاري (15)