Sulaiman al-A'mash الأعمش / سليمان بن مهران · The Book on Virtues of Jihad

"I heard my father saying in the presence of the enemy: 'The Messenger of Allah (ﷺ) said: "Indeed, the gates of Paradise are under the shadows of the swords.'" A man among the people with ragged appearance said: 'Have you heard what you mentioned from the Messenger of Allah (ﷺ) ?' He said: 'Yes.' So he returned to his comrades and bid them Salam (farewell), broke the sheath of his sword, and began fighting with it until he was killed."…

that the Messenger of Allah (ﷺ) was asked: "Which of the people are most virtuous?" He said: "A man who take part in Jihad in Allah's cause." They said: "Then whom?" He said: "Then a believer who stays in one of the mountains path out of Taqwa for his Lord, leaving the people secure from his evil." This Hadith is Hasan Sahih.

"Salman Al-Farisi passed by Shurahbil bin As-Simt while he was in garrison in which he and his companions were suffering from difficulties. He said to him: 'Shall I narrate to you - O Ibn As-Simt - a Hadith I heard from the Messenger of Allah (ﷺ) ?' He said: 'Of course.' He said: 'I heard the Messenger of Allah (ﷺ) saying: "(Ribat) Guarding the frontier for a day in the cause of Allah is more virtuous" - and perhaps he…