Hazrat Jabir ibn Abdullah narrates,
“When the Trench (battle of Trench) was dug, I saw Rasulullah (Sallallahu alayhi wa Sallam) in the state of severe hunger.

So I returned to my wife and said, "Have you got anything (to eat), for I have seen Allah's Apostle (Sallallahu alayhi wa Sallam) in a state of severe hunger." She brought out for me, a bag containing one Saa (about 2n a half kg) of barley, and we had a domestic she animal (sheep) which I slaughtered then, and my wife ground the barley and finished around the time I finished my job (i.e. slaughtering the sheep).

Then I cut the meat into pieces and put it in an earthenware (cooking) pot, and returned to Rasulullah (Sallallahu alayhi wa sallam).

My wife said, "Do not disgrace me in front of Rasulullah (Sallallahu alayhi wa sallam) and those who are with him." So I went to him and said to him secretly,
"O Allah's Apostle! I have slaughtered a she-animal of ours, and we have ground a Saa of barley, which was with us. So please come, you and another person along with you.

"Rasulullah (Sallallahu alayhi wa sallam) raising his voice announced, "O people of the Trench! Jabir has prepared a meal so let us go." Rasulullah (Sallallahu alayhi wa sallam) said to me, "Don't put down your earthenware meat pot (from the fire) or bake your dough till I come.

So I came (to my house) and Rasulullah (Sallallahu alayhi wa sallam) too, came, proceeding before the people. When I came to my wife, she said, "May Allah do such-and-such to you." I said, "I have told the Prophet of what you said." Then she brought out to him (i.e. the Prophet the dough, and he inserted some saliva in it, and invoked for Allah's Blessings in it.

Then he proceeded towards our earthenware meat-pot and inserted some saliva in it and invoked for Allah's Blessings in it.

Then he said (to my wife): "Call a lady-baker to bake along with you and keep on taking out scoops from your earthenware meat-pot, and do not put it down from its fireplace." They were one thousand (who par took of the meal ), and by Allah they all ate, and when they left , our earthenware pot was still bubbling (full of meat) as if it had not decreased, and our dough was still being baked as if nothing had been taken from it.

(Sahih Bukhari – Chapter on Ghazawaat – Battles)