There are seven levels of (authentic) ḥadīth, and they are:

فمراتب الأحاديث سبعة وهي:

1. A ḥadīth that was collected by both al-Bukhārī and Muslim.

1 – ما اتفق عليه البخاري ومسلم.

2. A ḥadīth that was collected by al-Bukhārī (but not by Muslim).

2 – ما انفرد به البخاري.

3. A ḥadīth that was collected by Muslim (but not by al-Bukhārī).

3 – ما انفرد به مسلم.

4. A ḥadīth that is authentic according to the conditions of both al-Bukhārī and Muslim but was not collected by either of them. It is sometimes described as “Upon the conditions of the Ṣaḥīḥayn.”

4 – ما كان على شرطهما. وأحياناً يعبرون بقولهم: على شرط الصحيحين، أو على شرط البخاري ومسلم.

5. A ḥadīth that is authentic according to the conditions of al-Bukhārī (but was not collected by him).

5 – ما كان على شرط البخاري.

6. A ḥadīth that is authentic according to the conditions of Muslim (but was not collected by him).

6 – ما كان على شرط مسلم.

7. A ḥadīth that is authentic according to the conditions of other scholars of ḥadīth (who collected only authentic aḥadīth such as Ibn Khuzaymah and Ibn Ḥibbān in their Ṣaḥīḥs).

7 – ما كان على شرط غيرهما.

Muḥammad b. Ṣāliḥ al-ʿUthaymīn, Sharḥ al-Mandhūmah al-Bayqūniyah fī Muṣṭalaḥ al-Ḥadīth 1/42

“`ابن عثيمين، شرح المنظومة البيقونية في مصطلح الحديث ١/٤٢”`