Saad 38:44

[We said], “Take a bunch of grass in your hand, and strike [your wife] with it, and do not break your oath[19].” We truly found him patient – an excellent and faithful slave he was. He constantly turned [to Us].

[19] When Job was afflicted with illness, everyone abandoned him except his wife. Once he became angry with her and vowed to punish her with one hundred lashes if he recovered. According to Allah's instruction, the oath was fulfilled by striking her once with one hundred blades of grass without harming his wife.

[We said], "And take in your hand a bunch [of grass] and strike with it and do not break your oath."[1329] Indeed, We found him patient, an excellent servant. Indeed, he was one repeatedly turning back [to Allāh].

[1329] At a point during his illness, Job became angry with his wife and swore that if he recovered, he would punish her with one hundred lashes. According to Allāh's instruction, the oath was fulfilled by striking her once with one hundred blades of grass.

44. "And take in your hand a bundle of thin grass and strike therewith (your wife), and break not your oath.[1] Truly! We found him patient. How excellent a slave! Verily he was ever oft-returning in repentance (to Us)!

[1] (V.38:44) During the ailment of Ayyûb (Job), his wife used to beg for him, and Satan told her a word of disbelief to say and she told her husband [Ayyûb (Job)]; so he became angry with her and took an oath to strike her one hundred lashes. So Allah ordered Ayyûb (Job) to fulfil his oath by striking her with the bundle of thin grass. (Tafsîr Al-Qurtubi,).

And (it was said unto him): Take in thine hand a branch and smite therewith, and break not thine oath. Lo! We found him steadfast, how excellent a slave! Lo! he was ever turning in repentance (to his Lord).