This weighed heavily upon him and his companions, so he said: "Shall I not tell you, O Ibn al-Simt, a hadith that I heard from the Messenger of Allah, peace and blessings be upon him?" He said: "Yes." He said: "I heard the Messenger of Allah, peace and blessings be upon him, say: 'A day of guarding the frontier in the path of Allah is better—and perhaps he said: more virtuous—than a month of fasting and its night prayers. And whoever dies in it is protected from the trial of the grave, and his deeds are made to grow for him until the Day of Resurrection.'" (1)
This is a good (hasan) hadith.

1761 - We were told by Ali ibn Hujr, who said: We were informed by al-Walid ibn Muslim, from Isma'il ibn Rafi', from Sumayy, from Abu Salih, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "Whoever meets Allah without any trace of jihad, meets Allah with a breach in him." (2)
This is a strange (gharib) hadith among the narrations of al-Walid ibn Muslim from Isma'il.

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(1) Authentic (sahih). It was narrated in similar wording by Muslim (1913), al-Nasa'i 6/39, and it is in al-Musnad (23727). Ibn Hibban declared it authentic (4623), (4625), and (4626).
(2) Its chain is weak. Isma'il ibn Rafi' is weak according to them, except al-Bukhari, for he said: "Trustworthy, with acceptable hadith," as quoted from him by the compiler here. He contradicted in its wording 'Umar ibn Muhammad ibn al-Munkadir, whom Muslim and others counted—and he is trustworthy. Sumayy is the freed slave of Abu Bakr ibn Abd al-Rahman ibn al-Harith ibn Hisham.
It was narrated by Ibn Majah with the compiler's wording (2763).
It was narrated by Muslim (1910), Abu Dawud (2502), and al-Nasa'i 6/8 via the route of 'Umar ibn Muhammad ibn al-Munkadir, from Sumayy, the freed slave of Abu Bakr, with the wording: "Whoever dies without having fought, and without having resolved in himself to fight, dies on a branch of hypocrisy." It is also in Ahmad's al-Musnad (8865).