Abu Hurairah reported,
He traced it back to the Prophet ﷺ, who said, "Allah 
says, 'Whoever loses his two beloved ones and bears it patiently, seeking reward, I will be content with no recompense for him short of Paradise.'"
Tirmidhi 2401
Sahihحدثنا محمود بن غيلان حدثنا عبد الرزاق أخبرنا سفيان عن الأعمش عن أبي صالح
عن أبي هريرة
رفعه إلى النبي ﷺ قال يقول الله عز وجل من أذهبت حبيبتيه فصبر واحتسب لم أرض له ثوابا دون الجنة
[Sahih]. Ahmad also narrated it: 265/2, from Abdul-Razzaq, with the same wording. Nasai narrated it in Kubra, no. 11446, from the hadith of Amash, with the same wording, and Suhayl corroborated him, as found in Ibn Hibban, no. 707. The hadith has corroborating narrations in Ibn Hibban, no. 705, and elsewhere. See the previous hadith.There is also a narration on this topic from Irbad bin Sariyah [Ibn Hibban, no. 706].