Comentario sobre Génesis 23:16

וישקל אברהם לעפרן AND ABRAHAM WEIGHED TO EPHRON [THE SILVER] — The name Ephron is written defectively (without the ו) to indicate that there was something missing in Ephron viz, sincerity — because he promised much but did not do even the very least (Bava Metzia 87a): He took from him big Shekels, viz., centenaria (worth a full 100 smaller units) as it is said, “money current with the merchant” which means, such coins as were everywhere accepted as worth a full Shekel — for there are places where their Shekels are of large size, centenaria; old French Centenars (cf. Ruth R. 7).

וישמע אברהם, he understood what Efron was hinting at and did not want to spell out.

וישקל אברהם לעפרן: The name עפרן is missing a 'ו'. The Ba'al Haturim explains that he had an evil eye, and the name of עפרן without a 'ו' adds in gematria to ר״ע עי״ן (evil eye). The reason for this comes from a statement in Bava Batra (9B) which states that whoever gives a coin to a poor person is blessed with 6 blessings, and whoever is stingy with the poor is not blessed with these 6 blessings. It is for this reason that Efron lost his 'ו' (which has the numerical value of 6) - as he was stingy he lost 6 blessings. Our sages also tell us (Sotah 36B) that we give the glass of blessing to a generous spirit, as the verse states טוב עין הוא יבורך (with a 'ו') - Don't read 'he is blessed', but rather 'he will bless'. Both the literal reading and the way it is read are true - someone who blesses others generously will be blessed with the six blessings (as depicted by the 'ו' in יבורך).