The word medhī indicates jealousy of others. The gṛhamedhīs, being interested in family affairs only, are certainly envious of others. Therefore, one gṛhamedhī is not on good terms with another gṛhamedhī, and in the extended form, one community, society or nation is not on good terms with another counterpart of selfish interest. In the age of Kali, all the householders are jealous of one another because they are blind to the knowledge of ultimate truth.
(Srimad Bhagavatam---2:1:2---purport).

In this material world, everyone has become a servant of the senses. Originally everyone is a servant of Kṛṣṇa, but in ignorance one forgets this, and thus one is engaged in the service of māyā through lusty desires, anger, greed, illusion, madness and jealousy. Everyone is actually dependent on the reactions of material laws, but still one thinks himself independent and thinks that he has conquered all directions. In conclusion, one who thinks that he has many enemies is an ignorant man, whereas one who is in Kṛṣṇa consciousness knows that there are no enemies but those within oneself—the uncontrolled mind and senses.
(Srimad Bhagavatam---7:8:10---purport).

A Vaiṣṇava sannyāsī or a Vaiṣṇava in the second stage of advancement in spiritual knowledge can understand four principles—namely, the Supreme Personality of Godhead, the devotees, the innocent and the jealous—and he behaves differently with each. He tries to increase his love for Godhead, make friendship with devotees and preach Kṛṣṇa consciousness among the innocent, but he avoids the jealous who are envious of the Kṛṣṇa consciousness movement.
(Sri Caitanya Caritamrta---1:7:67---purport).

One who is envious of the success of a Vaiṣṇava is certainly not a Vaiṣṇava himself but is an ordinary, mundane man. Envy and jealousy are manifested by mundane people, not by Vaiṣṇavas. Why should a Vaiṣṇava be envious of another Vaiṣṇava who is successful in spreading the holy name of the Lord? An actual Vaiṣṇava is very pleased to accept another Vaiṣṇava who is bestowing the Lord's mercy. A mundane person in the dress of a Vaiṣṇava should not be respected but rejected. This is enjoined in the śāstra (upekṣā). The word upekṣā means neglect. One should neglect an envious person. A preacher's duty is to love the Supreme Personality of Godhead, make friendships with Vaiṣṇavas, show mercy to the innocent and reject or neglect those who are envious or jealous. There are many jealous people in the dress of Vaiṣṇavas in this Kṛṣṇa consciousness movement, and they should be completely neglected. There is no need to serve a jealous person who is in the dress of a Vaiṣṇava. When Narottama dāsa Ṭhākura says chāḍiyā vaiṣṇava sevā nistāra peyeche kebā, he is indicating an actual Vaiṣṇava, not an envious or jealous person in the dress of a Vaiṣṇava.
(Sri Caitanya Caritamrta---2:1:218---purport).

Almost all the conditioned souls within the material world are envious. Jealous people generally turn against one who automatically attains some reputation. This is natural for jealous people. Consequently, when a devotee is fit to receive worldly reputation, he is envied by many people. This is quite natural. When a person, out of humility, does not desire fame, people generally think him quite humble and consequently give him all kinds of fame. Actually a Vaiṣṇava does not hanker after fame or a great reputation.
(Sri Caitanya Caritamrta---2:4:147---purport).