al-Laith bin Sa'd الليث بن سعد · The Book on Vows and Oaths

That the Messenger of Allah (ﷺ) came across 'Umar while he was on his mount, and he was swearing by his father. So the Messenger of Allah (ﷺ) said: "Verily Allah prohibits you from swearing by your fathers. So let the one who swears, swear by Allah, or be silent."

"A Woman vowed to walk to the House of Allah, so the Prophet (ﷺ) asked about that, and he said: 'Verily Allah is in no need of her walking, order her to ride.'"