Practices During Eid & Syawal

5) No Fasting on Eid-ul-Adha and 'Eid-ul-Fitr

وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَبَّانَ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، - رضى الله عنه - أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنْ صِيَامِ يَوْمَيْنِ يَوْمِ الأَضْحَى وَيَوْمِ الْفِطْرِ ‏.‏

Abu Huraira (Allah be pleased with him) reported that the Messenger of Allah (ﷺ) forbade fasting on these two days. 'Eid-ul-Adha and 'Eid-ul-Fitr.

Sahih Muslim 1138

https://sunnah.com/muslim:1138 

6) Du'a When Meeting During Eid

It was narrated that that Sahaabah (may Allaah be pleased with them) used to congratulate one another on the occasion of Eid by saying *Taqabbal Allaahu minna wa minkum (May Allaah accept (this worship) from us and from you)*. It was narrated that Jubayr ibn Nufayr said: When the companions of the Messenger of Allaah (peace and blessings of Allaah be upon him) met one another on the day of Eid, they would say to one another: “Taqabbal Allaahu minna wa minkum (May Allaah accept (this worship) from us and from you).” 

Al-Haafiz said: Its isnaad is hasan.

Hadith Mauquf

Status Hasan

https://www.google.com/amp/s/islamqa.info/amp/en/answers/49021 

7) Fasting Ramadhan Followed by 6 days Syawal is Like Fasting Perpetually

حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ بْنُ سَعِيدٍ، وَعَلِيُّ بْنُ حُجْرٍ، جَمِيعًا عَنْ إِسْمَاعِيلَ، - قَالَ ابْنُ أَيُّوبَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، - أَخْبَرَنِي سَعْدُ بْنُ سَعِيدِ بْنِ قَيْسٍ، عَنْ عُمَرَ، بْنِ ثَابِتِ بْنِ الْحَارِثِ الْخَزْرَجِيِّ عَنْ أَبِي أَيُّوبَ الأَنْصَارِيِّ، - رضى الله عنه - أَنَّهُ حَدَّثَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ صَامَ رَمَضَانَ ثُمَّ أَتْبَعَهُ سِتًّا مِنْ شَوَّالٍ كَانَ كَصِيَامِ الدَّهْرِ ‏"‏

Abu Ayyub al-Ansari (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:

He who observed the fast of Ramadan and then followed it with six (fasts) of Shawwal. it would be as if he fasted perpetually.

Sahih Muslim 1164 a

https://sunnah.com/muslim:1164a

https://sunnah.com/abudawud:2433

https://sunnah.com/ibnmajah:1716