Tafsīr al-Qummi: He said, it was narrated to me by my father, from al-Qāsim bin Moḥammed, from Sulaymān bin Dāwūd al-Manqari, from Ḥafs bin Ghayāth, who said:

Abū ʿAbd Allāh عليه السلام described the al-Ṣirāṭ,1 so he said: A thousand years of ascent, and a thousand years of descent, and a thousand years of hiking.

1. al-Ṣirāt (الصراط) is the bridge, hair-line in width, which everyone will have to pass through it on the Day of Judgement.
Some traditions say some people will pass like lighting, some will pass quickly, some will pass walking, some will pass slowly while crawling, being burned by its flames in the process.
There’s a tradition in al-Kāfi, that describes the supplication that Imām ʿAlī عليه السلام would recite while making ablution – where he would wipe his feet and say: Oh Allāh, make my feet firm on the Ṣirāt on the day which many will slip and fall.

وعنه : وحدثني أبي ، عن القاسم بن محمد ، عن سليمان بن داود المنقري ، عن حفص بن غياث ، قال : وصف أبو عبدالله ( عليه السلام ) الصراط ، فقال : « ألف سنة صعود ، وألف سنة هبوط ، وألف سنة حدال » .