مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4225
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah said: Your Prophet (ﷺ) was given everything except the five keys of the unseen: “Verily, Allah! With Him (Alone) is the knowledge of the Hour...” (Luqman 31:34).
Musnad Ahmad 4253Saheeh because of corroborating evidences]