Yahya bin Hamzah said that Sayyiduna Abu Salamah (may Allah be pleased with him) narrated to me that the Prophet (peace and blessings be upon him) was asked about a matter which was neither in the Qur'an nor in the Hadith. The Prophet (peace and blessings be upon him) said: "The devout believers will contemplate about it."
Hadith Referenceسنن دارمي / مقدمه / 119
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده صحيح وهو مرسل، [مكتبه الشامله نمبر: 119]
Hadith Takhrijاگرچہ یہ مرسل روایت ہے لیکن سند صحیح ہے۔ دیکھئے: [مراسيل أبى داؤد 457-458] ، [المعجم الكبير 353] ، [جامع بيان العلم 1810] ، [إبانه 293] ، [فتح الباري 266/13]
Brief Explanation
(Commentary on Ahadith 115 to 119) This narration is evidence for consensus (ijma‘).