Practicing upon just Four ahadith to save your deen as per Imam Abu Dawud.
Ibn katheer said:
وقال الخطيب: حدثني أبو بكر محمد بن علي ابن إبراهيم القاري الدينوري من لفظه، قال: سمعت أبا الحسين محمد بن عبد الله بن الحسن القرصي قال: سمعت أبا بكر بن داسه يقول: سمعت أبا داود يقول: كتبت عن رسول الله ﷺ خمسمائة ألف حديث، انتخبت منها ما ضمنته كتاب السنن، جمعت فيه أربعة آلاف حديث وثمانمائة حديث، ذكرت الصحيح وما يشبهه ويقاربه، ويكفي الإنسان لدينه من ذلك أربعة أحاديث، قوله عليه السلام: «إنما الأعمال بالنيات».
الثاني قوله: «من حسن إسلام المرء تركه ما لا يعنيه».
الثالث قوله: «لا يكون المؤمن مؤمنا حتى يرضى لأخيه ما يرضاه لنفسه».
الرابع قوله: «الحلال بين والحرام بين وبين ذلك أمور مشتبهات».
Khateeb (Baghdadi narrated from his chain of narrators).. Abu Dawud said: I wrote 5 lac ahadith from Prophet peace be upon him and I chose 4800 ahadith for my sunan, among them are Saheeh, similar to Saheeh and close to saheeh. But to save the religion , four ahadith are sufficient for people.
1. (The value of) an action depends on the intention behind it.
2. “It is from the excellence of (a believer’s) Islam that he should shun that which is of no concern to him”.
3. “A believer is not a believer until he accepts for his brother what he would like for himself.”
4. “The lawful is clear and the unlawful is clear, and between that are matters that are doubtful” [quoting full hadith](many of the people do not know whether it is lawful or unlawful. So whoever leaves it to protect his religion and his honor, then he will be safe, and whoever falls into something from them, then he soon will have fallen into the unlawful. Just like if someone grazes (his animals) around a sanctuary, he would soon wind up in it. Indeed for every king is a sanctuary (pasture), and indeed Allah’s sanctuary is what He made unlawful.”)
(al Bidaya wal Nihaya under 275 h)