It is slippery on which there are clamps and (hooks like) thorns which are wide at one side and narrow at the other and have bent ends.
A plant with such thorns is found in Najd and is called al-Sa’daan.
1, Some of the believers will cross as quickly as the wink of an eye,
2, Some others as quick as lightning,
3, like a strong wind,
4, or fast horses
5, or she-camels
6, So some will be safe without any harm;
7, some will be safe after receiving some scratches,
8, and some will fall down into Hell (Fire)
9, The last person will cross by being dragged
It is narrower than a hair and sharper than a sword.
Answer
Pul siraat
In Saheeh al-Bukhaari (7439) and Muslim (183)
it is narrated from Abu Sa‘eed al-Khudri (may Allah be pleased with him) in a lengthy hadith: “……
Then the bridge will be laid across Hell.’ We said, “O Messenger of Allah! What is the bridge?’ He said, ‘It is a slippery (bridge) on which there are clamps and (hooks like) thorns which are wide at one side and narrow at the other and have bent ends.
A plant with such thorns is found in Najd and is called al-Sa’daan. Some of the believers will cross the bridge as quickly as the wink of an eye, some others as quick as lightning, a strong wind, or fast horses or she-camels. So some will be safe without any harm; some will be safe after receiving some scratches, and some will fall down into Hell (Fire). The last person will cross by being dragged (over the bridge).”
Muslim added: Abu Sa‘eed said: I heard that the bridge is narrower than a hair and sharper than a sword