Surah Al-Kahf 18:20

Their awakening and sending One of Themselves to buy Food Allah says: `just as We caused them to ...

(How long have you stayed (here)) meaning, `how long have you slept'

(They said: "We have stayed a day or part of a day.") because they entered the cave at the beginning of the day, and they woke up at the end of the day, which is why they then said,

("...or a part of a day." They said: "Your Lord knows best how long you have stayed...") meaning, `Allah knows best about your situation.' It seems that they were not sure about how long they had slept, and Allah knows best. Then they turned their attention to more pressing matters, like their need for food and drink, so they said:

(So send one of you with this silver coin of yours) They had brought with them some Dirhams (silver coins) from their homes, to buy whatever they might need, and they had given some in charity and kept some, so they said:

(So send one of you with this silver coin of yours to the town,) meaning to their city, which they had left. The definite article indicates that they were referring to a known city.

(and let him find out which is the Azka food.) Azka means "purest", as Allah says elsewhere,

(And had it not been for the grace of Allah and His mercy on you, not one of you would ever have been pure Zaka from sins) 24:21 and

(Indeed whosoever purifies himself Tazakka shall achieve success.) 87:14 From the same root also comes the word Zakah, which makes one's wealth good and purifies it.

(And let him be careful) meaning when he goes out buying food and coming back. They were telling him to conceal himself as much as he could,

(and let no man know of you. For, if they come to know of you, they will stone you) means, `if they find out where you are,'

(they will stone you or turn you back to their religion;) They were referring to the followers of Decianus, who they were afraid might find out where they were, and punish them with all kinds of torture until they made them go back to their former religion, or until they died, for if they agreed to go back to their (old) religion, they would never attain success in this world or the Hereafter. So they said:

(and in that case you will never be successful.)

Kemudian para penghuni gua itu memperingatkan Tamlikha jika sampai penduduk kota itu, yang menurut perkiraannya masih orang-orang kafir, mengetahui tempat persembunyian mereka, mereka tentu akan dipaksa untuk mengikuti agama berhala. Jika mereka menolak, tentu akan dibunuh dengan lemparan batu, cara pembunuhan pada masa dahulu bagi mereka yang berani melawan kebijakan politik raja atau agama negara. Kota yang akan didatangi itu ialah kota Ephesus dan rajanya menurut persangkaan mereka masih Decyanus yang zalim itu. Padahal raja itu sudah tidak ada karena dia berkuasa pada tiga abad yang silam. Jika mereka dipaksa kembali untuk memeluk agama Decyanus itu, mereka tidak akan memperoleh kebahagiaan dan keberuntungan untuk selama-lamanya, baik dalam kehidupan duniawi ataupun ukhrawi. Jiwa orang yang menganut suatu agama karena dipaksa, pada mulanya, akan menolak segala ketentuan-ketentuan dari agama itu. Akan tetapi, lama-kelamaan kemungkinan besar jiwanya tidak akan menolak dan seterusnya memandang baik agamanya yang baru itu. Jika terjadi hal yang demikian, dia akan sesat dan sengsara untuk selama-lamanya. Akan tetapi, bilamana seseorang dipaksa dengan ancaman untuk pindah kepada kekafiran, lalu dia menunjukkan kekafiran, tetapi batinnya tetap Islam, dan sampai akhir hayatnya tidak pernah memandang baik agama yang dipaksakan itu, maka dia tetap dalam Islam.