Bukhari

Hadith Commentary:
From here, the chapter heading is derived.
That is, we did not inquire whether he possessed wealth or not.
It is understood from this that salam (forward sale) is permissible with any person.
Whether the subject of the salam (muslim fihi) or its origin is present with him or not, it is at least necessary to know that the one entering into the transaction has the ability to fulfill it—either by purchasing from the market at the appointed time, or by obtaining it from his own cultivation or labor, etc.
If a person is completely destitute and still enters into a salam sale, it appears that he intends, by this deception, to usurp his Muslim brother’s money.
And nowadays, this commonly occurs.
It is mentioned in the hadith that Allah assists the one who sincerely intends to repay, so that he is able to pay on time; but the one whose intention is to consume (the wealth), even natural assistance deserts him.
Regarding the investigation of the word “Anbat,” Allamah Shawkani states:
JAM‘U NUBAYT:
WA HUM QAWMUN MA‘RUFUN KANU YANZILUNA BIL-BATA’IH BAYNA AL-‘IRAQAYN QALAHU AL-JAWHARI, WA ASLUHUM QAWMUN MIN AL-‘ARAB DAKHALU FI AL-‘AJAM WA IKHTALATAT ANSABUHUM WA FASADAT ALSINATUHUM, WA YUQALU LAHUM:
AL-NABATU BIFATHATAYN, WA AL-NABITU BIFATHI AWWALIHI WA KASRI THANIHI WA ZIYADATI TAHTANIYYAH, WA INNAMA SUMMU BIDHALIKA LIMARIFATIHIM BI-INBATI AL-MA’:
AY:
ISTIKHRAJIHI LIKATHRATI MU‘ALAJATIHIM AL-FILAHATA WA QILA:
HUM NASARA AL-SHAM, WA HUM ‘ARAB DAKHALU FI AL-RUM WA NAZALU BAWADI AL-SHAM WA YADULLU ‘ALA HADHA QAWLUHU:
“MIN ANBAT AL-SHAM” WA QILA:
HUM TA’IFATAN:
TA’IFAH IKHTALATAT BIL-‘AJAM WA NAZALU AL-BATA’IH WA TA’IFAH IKHTALATAT BIL-RUM WA NAZALU AL-SHAM (Nayl al-Awtar)
That is, the word “Anbat” is the plural of “Nabit.”
These people used to reside in the stony plains of Iraq; originally, they were Arabs, but after entering the non-Arab lands (‘Ajam), their lineages and their language became mixed.
They were called “Nabat” and also “Nabit.”
This is because this people had great expertise in the art of agriculture and irrigation.
They had a special skill in extracting water.
“Inbat” refers to the extraction of water.
For this reason, they were called the people of Anbat.
It is also said that they were the Christians of Syria (Sham), who were Arab by lineage, but after entering Rome, they settled in the valleys of Syria.
The phrase “Anbat al-Sham” in the narration indicates this.
It is also said that they were two groups: one group mixed with the non-Arabs (‘Ajam) and settled in the plains of Iraq, and the other group mixed with the Romans and settled in Syria (Sham).
In any case, these people were cultivators, and they used to bring stores of wheat to sell in the land of Arabia.
Especially, their commercial relationship with the Muslims of Madinah had increased to such an extent that every lawful cash and credit transaction with them had become customary, as is evident from this hadith.

Hadith Commentary:
(1)
In this hadith, "asl" (origin) refers to "the source of the thing that is to be delivered in the future." For example, the origin of wheat is the crop, and the origin of fruits is the trees.
The meaning is that in a salam sale (bay‘ al-salam), it should not be stipulated that the person with whom the transaction is being made must also possess the sources of the required item. For instance:
It is not necessary that those from whom eggs are being purchased must own a poultry farm, or that a wheat transaction can only be made with farmers or landowners.
It is possible that someone does not own even a single chicken or a single wheat plant, yet can provide thousands of dozens of eggs or thousands of maunds of wheat.

(2)
An objection may arise here that there is a possibility of deception in this sale, because if the person does not possess the source, then from where will he provide the goods? This hadith provides the answer to this objection.